I'm not a big fan of +/- for individual games, but in a long sample period it can be telling. According to 82games.com, the best Bucks trio is this:
As of February:
Bell - Redd - Mason
They ranked around 25th in the league... promising right? The Bucks best trio is one of the worst in the entire NBA

For comparative purposes, Szczerbiak - Wilcox - Thomas rank higher, Felton - Carroll - Richardson ranked higher, Robinson - Crawford - Lee ranked higher also.
The worst Bucks trio: Redd - Yi - Bogut... interestingly this trio (despite being terrible statistically) had played more minutes than 90% of other teams worsts, including Boston who's worst trio had played only 83 minutes together (compared with the 885 for Redd/Yi/Bogut). The ranked around 6th (6th worst in the L of all trios).
Also, there are some really interesting team statistics, where they have individual statistic Win/Loss scores against teams they rank in those categories as either "Good (league rank 1-10)", "Average (11-20)" "Poor (21+)". For example, if the Bucks play the #20th ranked shot blocking team (considered Average) and are beaten 8-5, it would look like this:
W - 0
L - 1
Net - -3
If that makes sense. Anyway, you can find them all here http://www.82games.com/0708/0708MIL4.HTM but I decided to do some averaging...
There are 11 counted categories:
Points For, Points Against, Net Points, Off eFG%, Def eFG%, FTA Net, Rebounds, TUrnovers, Assists, Blocks, Pace
Against "Good" teams... ranked 1-10 in the league for their respective statistical categories:
Wins - 5.9
Losses - 16.6
Against "Average" teams ... ranked 11-20:
Wins - 9.2
Losses - 14.4
Against "Poor" teams ... ranked 21+:
Wins - 7.8
Losses - 13.0
I can also tell you there is not one single statistical category against either Good, Average or Poor teams that the Bucks average a Win in. That's pathetic basically, in the past I've thought maybe 1 or 2 personell changes would do the team a World of good but after looking at all of this, I'm all for a complete overhaul.