I agree 100%, COD 4 was amazing. Every treyarch game sucked, it had a different feel then the others which didn't seem right. WAW had too many glitches and Black Ops was really difficult to enjoy. MW2 was good until the hacking, one man army noob tubes and the amount of little shits just coming into the series and ruining the experience for anyone trying to take the game somewhat serious. As for MW3 i think it's alright but it's not as fun to play the COD in general anymore and MW3 doesn't suck me in as much as the others.
It's probably a good thing I've lost interest in the series and basically shooters in general now, because all i ever did was scream at the tv like an idiot.