I think they just make to make it easier for xbox and ps3 player due to their limited buttons at controller?

there's acctualy a mouse+controller for ps3 gamers which is quite good for fps games and even in cod5 W@W it wasnt hard to lean in ps3, but this is based on my friends disk i borrowed mine was for pc :< even then leaning wasnt really a probelm.

I think there is a misconception that lean == pro (or not noob) >.>. I think all the ranting of lean is because you get used to it already.

Lean = +feature of Call of Duty series.