Um, Cliff lee has a career .168 batting average with 2 walks and 53 strike outs. He's having a career year this season, hitting .200. He still only has drawn 1 walk and has 26 strikeouts. Wow what an offensive stud Krup. 
I can name three just from recent St. Louis history without even needing to think about it:
Jason Maquis - Lifetime .273
Jeff Suppan - Lifetime .285
Adam Wainright - Lifetime .244
All they do is hit, they've been doing it their entire career. It's their job.
Uh, yeah, it's also their job to be able to PLAY THEIR POSITION IN THE FIELD. Ozzie Smith wasn't nearly one of the best hitters in the history of the game at his position, but put together a list of the greatest shortstops of all time, and if he's not at the TOP of the list itself, he's damn well among the leaders because of what he did with his GLOVE. By contrast Mike Piazza was a HORRIBLE catcher. He was a great hitter, yes, but SO WHAT? He was an absolute liability behind the plate and quite frequently showed it, and that is NOT a position you want to sacrifice your defense (great catchers win more games with their glove than they EVER do with their bats).
So what the hell, why not go the football route and have completely separate offensive and defensive lines! Stack whole teams full of Bondses, Cansecos and Ortizes. Baseball is all about the home run ball, right? Because that's the ONLY reason the DH was ever brought in in the first place: to promote a single aspect of the game at the expense of others (and for those of you who think the DH makes AL teams automatically superior, I once did a World Series win calculation of the periods prior to and after the DH was introduced. IT DID NOT CHANGE. The AL won the same % of games AFTER the DH as they did BEFORE it. Tim McCarver needs to remember that fact before the next time he starts humping the AL's leg over it). Any time you see a team sacrifice defense for power, more often than not they pay a stiff price for it with plays not being made, and runs being given up that can make all the difference in the world (that's why it's almost always pitching and DEFENSE that decide playoff games).
What the DH gives you are players who only play HALF the game: Hitters who never have to take the field and couldn't play worth a damn even if they DID, and pitchers who never have to dig in. Even the BENCH guys who might get an At-Bat once a week have to be able to play both sides of the game, so why should pitchers be any different?