
There are only so many ways a manager can impact the outcome of a game. Most of the decisions a manager has to make, like removing a starting pitcher, pinch hitting, or intentionally walking a hitter are technically possible at all times. However, no reasonable observer would advocate going to the bullpen in the first inning unless there was an injury or a complete melt down by the pitcher. No one would suggest intentionally walking a batter to lead off the 7th in a tie game. Like batting order, once you narrow the moves a manager can make down to a fairly reasonable set of options, the decision amongst them isn't statistically likely to make much of a difference.
Martin spent 11 seasons as a player in the major leagues, six and a half with the Yankees. A second baseman by trade, Billy put in some time at third and short, allowing Casey Stengel some of the flexibility that he so cherished. In his playing days, Martin was scrappy and gritty and all of those terms that people use to describe players that appeared to be trying hard but weren't particularly good. He could play defense but couldn't really hit for average. Or power. Or get on-base. Or steal bases once he got on. But Stengel was Martin's most fervent advocate, so the Yanks kept him around.

In 1953 - one of his finer seasons with the Yanks - he was the only person on the team to appear in more than 60 games and have an OPS+ of less than 100. However, over the 28 World Series games in which he appeared, he hit .333, well above his career mark of .257.
It might have been this success in the World Series that endeared him to superstar teammates Mickey Mantle and Whitey Ford. The trio were legendary for their after hours gallivanting throughout New York City and on the road. The fact that he involved Mantle and Ford in his partying was what got him traded in the middle of the 1957 season following the legendary brawl at the Copacabana.
After Billy retired, he worked as a scout in the Twins' organization for three years, then was asked to serve as third base coach under his former manager, Sam Mele. Martin enjoyed his time as a scout and had no real aspirations to ascend the coaching ladder but agreed to come on board because he respected Mele. During that time, he mentored a left handed Rod Carew and was one of the few voices that insisted Carew was ready for the Major Leagues in 1967 when he took home Rookie of the Year honors.
In his first season as manager of the Denver Bears, Martin took over a team that started 7-22 and led them to a winning season. Graig Nettles was one of the players on the Bears that year and although he didn't much care for Martin at first, he eventually came around:
When I saw the results, I stopped hating Billy Martin and began to see him for what he was: an extraordinary leader.

Despite Martin's violent episode with the Twins, he landed another managerial gig in Detroit just a year later (where the fight with Boswell occurred, of all places). In his first season in Motown, the Tigers won 91 games, an 11 game increase from the year before, but finished second to Baltimore in the AL East. The following year they won only 86 games but edged the Red Sox by one game to win the division and went on to lose to the A's in the ALCS.
Despite his building reputation as a loose cannon, he landed on his feet in Texas before the season was over. In 1974, Martin presided over a 23 game advance, taking a Rangers team that had won just 57 games the year before up to 84 victories and a second place finish in the AL West. Martin was fired once again by Texas in 1975, after the team started to fade midway through the season. Within a week, he was hired by the Yankees and finished out the last 56 games of the season with them.
Amazingly, in his first full year in the Bronx, Martin again steered a team to a double digit rise in wins, from 84 to 97. The Yankees won the AL East that season and advanced to the World Series but were swept by the Reds.
During the subsequent offseason, despite the fact the team just won their first pennant in 12 years, George Steinbrenner, fresh off his suspension for illegal campaign contributions, started making moves. Chief among those was the acquisition of Reggie Jackson. Martin wasn't in favor of acquiring the Orioles' slugger. With the team in need of shortstop, Martin instead lobbied for signing the Orioles' Bobby Grich, one of the best second basemen in the game, who had experience at shortstop as well. Per usual, Steinbrenner got his way. Reggie came to the Bronx, the Yankees used their other free agent spot to sign pitcher Don Gullett, and Grich went to the Angels. Jackson made Oscar Gamble expendable, and he was flipped to the White Sox for shortstop Bucky Dent.

The madness didn't subside in 1978. Midway through the season Jackson ignored signs from Martin and bunted when it wasn't called for. This sent Martin over the edge. He told the press later that day about Jackson and Steinbrenner, respectively, "The two of them deserve each other - one's a born liar, the other's convicted."

But back to the original question. What made Billy Martin so good as a manager?
Out of 25 guys, there should be fifteen who would run through a wall for you, two or three who don't like you at all, five who are indifferent and maybe three undecided. My job is to keep the last two groups from going the wrong way.

He also used some odd tactics, like asking pitchers to hit and play other defensive positions. He had pitcher Fergie Jenkins DH in the 6th inning in a game in 1974, breaking up a no-hitter with a single to center, and later tried the same tactic with pitcher Rick Rhoden in 1988. He had Ron Guidry in center field and Don Mattingly at second when the Pine Tar Game was resumed in 1983. He had lefty swinging Mike Pagliarulo bat right handed in 1985. He literally drew the Yankees line-up out of a hat on April 21st, 1977 against the Blue Jays, a game which they won 8-6. In Oakland from 1980-1982 he employed "Billy Ball" - a combination of hit and runs, squeeze plays and stolen bases - despite the fact that his teams lead the AL in HRs.
He was the kind of guy who wasn’t afraid to tell you what he thought of you. If I got one hit in a game and hit a couple other balls well, but they were caught, what he’d say to me was, “You dumb-ass dago, you can’t get more than one hit.” Billy was very honest.
Billy could see the field so completely; he knew what everybody was doing.
A lot of the time, you have to make a player do something he doesn't want to do, for the good of the team, or to push him harder that he thinks he should be pushed. You can't do it if the player thinks "Why should I listen to him? He's not the boss. He may be gone next year. I'll do it my way" When that attitude takes hold, teams don't win.
Managing is teaching, first of all. That's even more important than winning itself. When you get a player whose potenital you can see, and show him things that can make him better, and show him the things that can make him win, and then you can see him later realizing those things - it's like a graduation. It makes you feel satisfied even if he's no longer your player.
For a team to win, a manager has to find ways to motivate different individuals. He has to judge correctly each man's abilities and weaknesses, and find the right ways and the right times to use them.
But the enjoyment comes from the things I put in.... The victory at the end is only proof that you succeded, and nobody can take that away from you once you've won. But the fun and the rewards are in what you do getting there.

He was fired that offseason and re-hired in 1985 when he won 91 games again, except this time he replaced Yogi Berra after 16 games and accomplished the feat in only 145. That September, Martin got in a fight with Ed Whitson in a hotel bar. Having lost his legendary brawling skills, Billy suffered a broken arm and two fractured ribs in the fight. As they often do of drunken brawls, accounts of the night vary, but the New York Times cited an unnamed source that said an official investigation by the Yankees indicated Martin was the instigator.
The team retired his number and gave him a plaque in Monument Park in 1986. He spent the '86 and '87 doing occasional TV work on WPIX Yankee telecasts.
