CoD4 & World at War. All these damn point streaks are annoying as hell, like the simplicity back then. Rather have more gun customization instead of swarms of pointstreaks just saying

I totally disagree with the OP.

MW3 is by far the worst CoD game.

It takes the worst things from MW2, (Boosting and Quickscoping), adds the worst thing from Black Ops (dreadful lag), and adds it's own truly horrible maps. And now apparently Infinity Ward are no longer banning people. Expect it to turn into a hacker's playground shortly!

Cod4, W@W, MW2, were all amazing games until Infinity Ward and Treyarch refused to do anything about the hacker problem.

Black Ops had enough innovation to generally be accepted by the community. And they cut boosting right down by not allowing tac-inserts in certain game modes (IW, why didn't you do this?) and got rid of quickscoping (again, IW, why didn't you do this?). But the terrible lag (allegedly caused by sending data to Elite) ruined the game for many people.

Infinity Ward need to play CoD4 and remember what made this series great, because it's been in a serious decline since MW2.