Got this e-mail from Pete Simpson of Baseball Graphs, whose site I raided Tuesday for Win Shares data to use for my look at Cesar Izturis and Alex Cora. I had e-mailed Pete to ask if he had any further comments, and he did:

Jon:
It's great to see other people using our site. The whole point of win shares is for analysis like yours.
A couple of things to add on the Dodger offense:
1. It's not just Izturis and Cora, although they are the most prominent. Daryle Ward has 0 runs created in 114 plate appearances, which would mean negative win shares, if such a thing were possible. This is by far the worst in the league for any player with any significant playing time (Wilson Delgado of the Cardinals has 0 runs created in 82 PA). For comparison purposes, Lenny Harris, batting .173 with little power, has 6 runs created in 144 PA.
Kaz Ishii has made 34 outs in 34 PA (0/26, with 8 SH).
Ron Coomer has 0 offensive win shares in 90 PA.
Odalis Perez has made 40 outs in 40 PA (1/34, 6 SH, 1 GIDP).
2. Overall, if the season ended today, the Dodgers would be the third most extreme defensive (pitching and defense) team since at least 1920. 74.6% of their win shares come from pitching and defense.
3. Dodger Stadium, which depresses offense by about 14%, is NOT responsible for the Dodger offense's low win shares. Win Shares fully corrects for this. Typically, extreme offensive teams play in pitcher's parks, and vice versa.