when you fire a weapon the cam should shake, it should put out smoke where the bullet hits and particles should spray. it should have devastating effect in damage and sight when shot at by these weapons.
just an idea because weapon effects in f.e.a.r. or camera effects in colinmcrae dirt have so much evolved. not that it has to be the same, but armas (and ofps) big weapons effects actually are still at year 2001 level graphics-wise.