I know it's in vogue to bash Mike Cameron, and I'm obviously disappointed in his performance, but here's an interesting stat from Baseball Prospectus showing how many extra base hits the Mariners and Mets OF are giving up (this may not format too well):

Mariners
opposing 2B+3B & as apx % of AB
2003 234 2.3%
2004 390* 6.8%*

Mets
opposing 2B+3B & as apx % of AB
2003 348 6.1%
2004 267* 4.4%*

* Projected over a full season