Some ps2 heavy hitters might be selling better on the PS3

[DKII]

I'll give you R&C. Though I think the main reason for its success was better marketing/hype, since I'd never even heard of R&C (or J&D for that matter) until the PS3 launched.

As for COD, look at the 360 sales:
COD4: 5.34M
COD3: 2.00M
COD2: 2.02M

Pretty obvious that COD4 is just that much better than COD2.