...Full autos are the best guns but nothing too overpowered imo, it actually takes a bit of skill to get consistent nade kills in this game...
Correction: I had not played Goldeneye for awhile and I got reminded that there are two overpowered weapons. The Masterton (semi-auto shotgun with hi capacity relatively quick load clips) and Proximity mines which are unlocked at level 52 & 53. There seems to be consensus on Gamefaqs that the Masterton (semi-auto shotgun) is the best gun and Proxy mines are evil considering most players will never play this game enough to unlock them -- I have added a mine finder perk on a custom class, screwing up my more favored perks when I have to counter. I have played this game for almost 5 days and have 15,200+ kills and only on level 35 out of 56. Level grinding is insane in Goldeneye, I will never play Goldeneye enough to unlock those overpowered weapons, at least I will therefore never nub it up with them.