I like using HK36 with silencer and either med scope or handle (depends on map) for SEALs, and the same with either the RA-14 or STG on terrs. (if anyone else has noticed this; the RA-14 is a teeny bit better in all it's stats to the STG, besides being heavier. It also seems to have more kickback)
I like playing stealthy. Like,
actually stealthy. Stealthy as in, if I see a sniper I'll cover the ground with smoke and come up behind him somehow.
Stealthy as in I'll let a guy go past me sometimes if I think his gun will raise attention as I kill him.