I'm not denying that he put up great numbers the last few years, but I'm saying that they are misleading because of the league he is pitching in. Some people believe Clemens will put up great numbers like that in the AL. THAT is just plain stupid thought. There is far more reason to believe that Clemens wont do any better for the Yankees than he did in the 5 year stretch from 99-03, but then add 4 years to his age since 03 and duribility concerns, and you have trouble.
I also disagree to an extent with you saying that his innings per game in Hou was misleading. Yes, there were situations where he was taken out for a PH, but last season he threw 1827 pitches through 113 innings. That equates to just over 16 pitches an inning. That means he is reaching 100 pitches on average after the 6th inning. Now, add another year to his age, throw him in the AL with a DH and tougher lineups, and tell me how he is going to be doing better than that? It is very reasonable to believe he is only going to be able to pitch an average of about 5 innings a game.
I agree that he will at least bring some stability to your rotation. But honestly, I think a rookie in the rotation would have a better overall value. He would probably give you similar performance, but probably give you more innings, a full season, and it wouldn't cost the team a penny. I don't think Clemens is worth it at $28 million and I don't think he would make signicantly more of a difference than say a rookie from the farm system.