Great Tips listed here.
I noticed when setting up classes you have to think of the kind of player you are. If you are more Rambo, run around the map continuously, type of player, your best bet is to set up a smg class. They are faster to use, high rate of fire for the most part, and great when coming off a sprint. if you are more strategic and stealthy, i go with Assault Riffles. they are powerful, easier to control, and more precise. Totally ninja like players (this super does not include campers, they don't count), snipers rule, especially paired with a silencer.