There are 4 that I can see being overused/OP

http://www.youtube.com/watch?v=1yZ6VV6iYBM&feature=plcp

The Type 25, an automatic, low recoil assault rifle

The M8a1, a 4 round burst weapon

The Skorpion Evo 3, a weapon similar to the MW3 PP90m1

And the Ballista, a sniper where you can use just the iron sights

What do you think?