What do you mean? I think all of the CoD games that Treyarch has made turned out fantastic. But then again, that's my opinion.
The only reasons I play MW3 instead of Black Ops is because it has a larger weapon selection and it runs faster on my computer.
Black Ops: Tiny window, low graphics, 40 FPS
MW3: Fullscreen, high graphics, 45 FPS
Hopefully Treyarch can pull that off in BO2