STL's pitchers (both SP and RP) lead the league with a 3.68 ERA and 1.24 WHIP. True, their RPs have been very good and bring those stats down, but these could be the best overall SPs by performacen this season:
Carpenter 3.51 ERA, 1.14 WHIP
Marquis 3.59 ERA, 1.4 WHIP
Suppan 3.98 ERA, 1.3 WHIP
W. Williams 4.06 ERA, 1.31 WHIP
Morris 4.4 ERA, 1.27 WHIP
They actually have five legit starters, unlike some teams that break down near the end of the rotation.
Houston is good, but has been inconsistent this season. Miller has been hurt. Oswalt is just coming around to past form. Clemens has been good, but the rest of the rotation...Munro, Hernandez, Backe, Redding, or whoever they've got filling it now? Ugh.
CHC is probably potentially the best rotation, but their performance this year doesn't exhibit that. Prior and Wood have been hurt a lot. Zam, Clement, and Maddux have been very solid, though. I'd put them up there, though, as the latter three have been absolutely superb. Wood has been good when pitching, too.
Hudson 2.95 ERA, 1.21 WHIP
Harden 3.69 ERA, 1.32 WHIP
Mulder 3.79 ERA, 1.25 WHIP
Redman 4.5 ERA, 1.45 WHIP
Zito 4.58 ERA, 1.45 WHIP
Redman's weak and Zito's been surprisingly uneffective this season, although he's pitching well recently.
When it's all said and done, I think CHC's performance has still been the best this season, but only by a hair over the surprising Cardinals. Give them props for keeping their team in games with quality starts. With that sort of offense, all you have to do is keep the team in the game. You have no pressure to win it all for them.