gold star for USAHOF
Arguably, Darryl Hamilton would have better seasons outside of Milwaukee, but the first half of his career was with the Brewers where he did offer some valuable contributions.  Hamilton would bat over .310 in two of Brewers campaigns and would also have a 41 Stolen Base season.  Overall, Hamilton 637 Hits with a .290 Batting Average as a Milwaukee Brewer.
Charlie Moore was with the Brewers for all but his final season in the Majors.  Moore was not a superstar, but was a useful role player who played both at Catcher and in Rightfield, providing depth and leadership.  Moore would slowly accumulate over 1,000 Hits as a Milwaukee Brewer and notably performed well in the 1982 Playoffs with a .462 ALCS and .346 World Series.
Darrell Porter is far more known for his work with the St. Louis Cardinals and the Kansas City Royals, but he would get his start in Milwaukee.  As a Brewer he would finish third in Rookie of the Year voting in 1973 and would make the All-Star Game in 1974.
Although Jose Valentin showed better seasons with the Chicago White Sox later in his career, he did produce good power numbers for the Brewers.  He would exceed 15 Home Runs three times as a Brewer and collected 577 Hits for the team.
Ken Sanders has to be considered the first real reliever in franchise history and was one of the few bright spots for the team in the early 1970’s.  Sanders would lead the American League in Saves in 1971 with 31, a very high number for those days.  He would also lead in Games Played and Games Finished that year.  He would actually finish 16th in MVP voting.

42. Dave May

The best season of Dave May’s career occurred in 1973 when he would make the All-Star Team and finish 8th in MVP voting.  That year, May would have 25 Home Runs with 189 Hits, a .303 Batting Average and would also lead the American League in Total Bases and Win Probability Added.  While Dave May would never have a season like that again, he would have another two decent campaigns with Milwaukee.  Over May's two runs in Milwaukee, he would have 652 Hits.
The best offense of John Briggs’ career occurred in the four seasons and change he played with the Milwaukee Brewers.  He would have two seasons where he would hammer 20 Home Runs, and his lowest production in that metric (for a full season anyway) was 17.  He would finish his run with the Brewers with 492 Hits and 80 Home Runs.
Rickie Weeks would have a long run with the Brewers, though it was mostly an up and down career.  Weeks’ best season was 2011 when he had 175 Hits with 29 Home Runs, leading the AL in Plate Appearances.  Weeks would smash 20 Home Runs in a row in three straight seasons and had over 1,000 Hits with Milwaukee.  He would be ranked higher had he not suffered defensively; five times he led all National League Second Basemen in Errors.
The first Pitcher to ever win 20 Games for the Brewers, Jim Colborn easily had his best year in Major League Baseball when he accomplished that feat.  That year Colborn was named to the All Star Team and finished 6th in Cy Young Voting.  He would have four other seasons with Milwaukee, but did not approach his accomplishments from 1973.

38. Cal Eldred

A Starting Pitcher for most of his career, Cal Eldred’s entire 1990’s was spent with the Milwaukee Brewers.  Eldred’s peak season was in 1993 when he led the American League in Games Started, Innings Pitched and Batters Faced.  He would go 16 and 16 that year and would have 10 Wins or more four times as a Brewer.  Overall, with Milwaukee, Eldred posted a reocrd of 64-65 with 686 Strikeouts.
An All-Star in 1978, Lary Sorenen would go 18 and 12 and finish 2nd in BB/9.  Sorensen was a very good control pitcher who would have two more seasons with 12 Wins or more and two more top ten finishes in BB/9.  Overall, he gave Milwaukee three good seasons as a Starting Pitcher, which was the first team he played for.  Sorensen had a Brewers record of 52-46.
Rollie Fingers would become a baseball Hall of Fame Relief Pitcher predominantly for what he accomplished with the Oakland Athletics but his lone Cy Young Award took place when he played for Milwaukee.  As a Brewer, Fingers would win the Cy Young and the MVP in 1981 and arguably had the most dominating season as a closer in Brewers history.

Milwaukee would be the last team that he played for in the Majors, and with the Brewers, he had 97 Saves with an ERA of 2.54.  Fingers was inducted into Cooperstown in 1992, and Milwaukee honored him further by retiring his number 34 the same year.

26. Moose Haas

An amazingly named baseball player (though he was not the behemoth you would have expected), Moose Haas was a Milwaukee Brewer for ten of twelve of his MLB seasons.  Haas was a decent control pitcher who would finish in the top ten in BB9 four times and ERA and FIP twice.  He would have 16 Wins in 1980, the season in which he led the American League in Winning Percentage.  Haas would have a record of 91-79 with an even 800 Strikeouts.
Realistically, B.J. Surhoff accomplished more with the Baltimore Orioles, but B.J. Surhoff was a Milwaukee Brewer for his first nine MLB seasons, the last of which saw him bat .320.  Surhoff would accumulate 1,062 Hits as a Brewer with only 323 Strikeouts.
The best run of Jeromy Burnitz’ career was the five years and change (1996-2001) he spent as a Milwaukee Brewer.  Burnitz would smack 30 Home Runs four years in a row, earning MVP votes in two of them, and going to the All-Star Game in one.  He would hit 165 Home Runs as a Brewer and was one of the few highlights on Brewers teams that were generally not very good.

With Milwaukee, Burnitz had 165 Home Runs, 714 Hits with a .258 Batting Average.
Richie Sexson was only with the Milwaukee Brewers for three and a half seasons but this was where he had his greatest offensive output.  Sexson had two 45 Home Run seasons as a Brewer and put together three straight seasons accumulating over 100 Runs Batted In.  He would also have a Slugging Percentage over .500 every year in Milwaukee.

As a Brewer, Sexson would go deep 133 times with a .536 Slugging Percentage.

24. Jim Slaton

Jim Slaton was a key Starting Pitcher for Milwaukee through the 1970s and as of this writing still holds the team record for Wins and Innings Pitched.  Slaton won 10 or more Games in nine seasons and went to the All-Star Game in 1977.  He also has a World Series win in their lone appearance in the Fall Classic, which was during his second Brewers run when he moved to the bullpen.

With Milwaukee, Slaton pitched in 268 Games and had a record of 117-121.

29. Dan Plesac

To date, Dan Plesac is easily the best reliever in Milwaukee Brewers' history.  Plesac, went to three straight All-Star Games (1987-89), carrying the Brewers bullpen in the late 1980s.  He would finish in the top five in Saves three times

As of this writing, Plesac is the franchise leader in Saves (133), Games Pitched (365) and Games Finished (269).
Greg Vaughn would get his start with the Milwaukee Brewers where he showcased some power with three consecutive 20 Home Run seasons, and in 2006 would have 31 in Milwaukee before he was traded to the San Diego Padres, a team he would later belt 50 dingers for.  While his most explosive offensive seasons were not as a Brewer, he was still a two-time All-Star in Milwaukee and had 169 Home Runs for the team.
Yovani Gollardo had six straight seasons with 10 Wins (two of which with 15 Wins) as a Starting Pitcher for the Brewers.  Gollardo was with Milwaukee for his first eight seasons, and would make the All Star Game in 2010 and finish seventh in Cy Young voting the year after.  Gollardo would also record 200 Strikeouts four years in a row, finishing in the top ten each time along with a pair of second place finishes in SO/9.  His Brewers tenure finished wish a respectable 89 and 64 record with 1,226 Strikeouts.