I only use the MP40 and the STG-44. They're the only ones I find usable to my play-style.
Fuck the snipers. They don't make any sound when fired now and there is no bullet trail. With the snipers being a one shot kill, you just fall down instantly and don't even have a chance to get out of the way. You can't see it either due to no bullet trail, so you die so fucking often to faggots who try quickscoping.