If you have been following the Milwaukee Brewers the past 15 years or so, you would realize the team has gone long stretches without a left-handed starter in their rotation. At other times, there were southpaws like Tom Gorzelanny, Chris Narveson, Glendon Rusch, and Manny Parra getting starts. Some of these lefties may have been decent for a stretch, but none of them would be good enough to sniff this list.
That being said, there have been some great left-handed starters in Brewers history. There also is a logjam of solid, yet unspectacular guys that could fall anywhere from #4 to #10.