Originally posted by Mateen
COD4 and WAW were on the same engine, so they had the same graphics.
MW2 was also on the same engine, except it added texture streaming which helped a lot.
Black ops is also on the same engine as MW2, so graphics will be identical.
Pretty much treyarch hasn't coded a game engine in any cod ever.
WRONG.
COD4 - Their own graphics
W@W - Enhanced COD4 graphics and engine
MW2 - New game engine (which could be why every other game out around that time had better graphics)
Black Ops - Enhanced W@W graphics and enhanced W@W engine