We need better configuration of the mouse control.
Example, in COD4 My mouse sense is set via console on 1.8. Trying to replicate that with a slider is a hard feat, as the slider moves in .5 increments. And the difference between 1.8 and 2.0 is rather big if you are really into that sorta thing.
For example. I cannot snipe on 2.0 in COD4, I over aim just that tad bit. Drop to 1.8 and I am as comfy as a wonderbra on a nice pair of funbags. Whereas I cannot SMG or AK on 1.8 cause its a bit to slow, I have to bump it to 2.0 or 2.2 to get my groove on.
With MW2 you can't do this as it only has a slider, and config changes give you da banhammer from VAC.
Secondly, they seriously need to rebalance the weapons, as some of them don't really correspond to their stats.