My reviews then
[*] G36C (Spec ops) - Kicks ass. Lot of stopping power @ short to medium range. Not a good sniping gun though.
[*] M95 (Sniper) - Don't waste your time with it. Less accurate than the M24 and doesn't do any more damage.
[*] G3 (Assault) - Powerful, but lack of grenade launcher and 20 round magazine may be a turn off to some.
[*] PKM (Support) - Powerful, but not many play support often enough for it to be worth unlocking. Lacks accuracy.
[*] Jackhammer (Engineer) - Powerful, but extremely short range limits effectiveness of the weapon.
[*] L85A1 (Medic) - Accurate in single shot. Quite deadly if you take your time to line up the shots. Horrible @ full auto.
[*] DAO-12 (AT) - Very powerful. Reload takes FOREVER though.
I did the G36C first, and am going with the L85A1 next.
It all depends on what classes you play the most though.