I haven't gotten too in depth in the multiplayer, just a few matches here and there. I've been mainly sticking to singleplayer to get used to the weapons and controls, and so far there is only one gripe that I have.
Don't like: The alt fire/zoom must be toggled to use, not press and hold.
Perhaps this can be patched? I don't mind this feature being a toggle for some weapons, but for weapons that utilize ADS like the SCAR, I don't want to frantically toggle back and forth in a firefight.