As far as criticisms go, menus and killcams are shit
They tried to make the menus fancy, but all they did was overcomplicate them. It's a huge pain in the ass just to change the scope on your gun. I wish they would've kept the Bad Company 2 menus and just updated the look, those were really easy to use.
Also, I really wish that they wouldn't automatically add whatever attachment you unlock to your gun. Tell me I unlocked it, and let me decide if I want to use it or not. I end up with an ACOG scope on a gun just because I unlocked it, and I have to go in and take it off.
Killcams are shit like you said. I get killed by a sniper and the killcam gives me an extreme close-up on his face and that's it.
I also can't seem to change my kit during the countdown before a round starts. I sit there for 30 seconds, and if I decide I want to play recon instead of assault, I can't change it until I start the match and die...