I have all but the fad unlocked in the ar category.
So far the honey badger is my favorite, then the arx then msbc. They are all solid however. (forgive me if I screwed up a name)
Sc2010 Is my favorite atm, but on my second character I have the honey badger unlocked and its a beast as well.
I really want to try out the 3 round burst gun as I've always enjoyed them.
Just finished playing for about 2.5hours, and wow! I really enjoy this game thus far. It ran very smooth with minimal lag. The dog can fuck off. Other than that, very good.