ACR wasn't the best in MW2 or MW3, so I don't know why you're trying to compare it to the AN-94.
The ACR's defining feature is low/basically no recoil. That would be the M27, which is by far the worst AR due to its terrible TTK up close in a game where most encounters are up close. --- And so begins a tale of vengeance and betrayal. Destiny by sinner sought. Tragedy by power wrought. Valkyrie Profile: Covenant of the Plume.
M27 fills the same role as the ACR. High fire rate low ttk very low recoil.
It doesn't have a high rate of fire at all. About the same as the MTAR, which both pale to the Type-25s, the AN-94's first two bullets, or the M8A1's burst. --- And so begins a tale of vengeance and betrayal. Destiny by sinner sought. Tragedy by power wrought. Valkyrie Profile: Covenant of the Plume.
MW2 or MW3 connotation of ACR? Or, in other words, are you looking for lack of recoil or lack of flaw? M27 has the least recoil. If you're looking for the best AR then it is arguably the AN-94. If you have the trigger finger to capitalize on the intrinsic 2-round burst then you have a gun that gets select fire for free, basically. The FAL is a great competitor but the auto mode for select fire has been nerfed to normalcy. --- Xbox Live: xXSpaceFlowerXx