Ok a couple things since this seems to make the rounds every so often.
First, the ACR was a full-auto M16 and totally unbalanced. It shouldnt have been that way in the first place and several things were done incorrectly. So it was the most noobish gun in the entire history of COD. Of course nobody told me at first and the complaints, to more than just myself, about the correct balancing caused me to say fuck it and out it went. Never coming back.
Two reasons for the nuke change. First consistency with MOAB or whatever in the other games. Second because of the added re-roll in addition to Hardline. It was too easy to get for a 3-kill ( 4-1) streak with two chances. So it was moved up and also made a free 4th streak for everybody.
A few weeks ago in another thread I said if 20 is too much then server admins you need to get together and take or vote on whether or not to lower it and what to. 14, 16, whatever. If nobody cares to do that and provide me the results ( how many voted for 14, or 16 etc ) then there is no reason to change it.