LTL weapons except the NL9 and the CCG (because they actually take some skill to use) Because why bother play the game when you click on someone once and they get a timeout for nearly a minute?
ATAC, I don't need to explain because anyone who's played at least an hour of this game already know every reason why.
HVR - Pretty much the easiest gun you'll ever use. Pair this with a friend using cqc and the other team don't stand a chance. 85 anyone from any shootable range. Pair this with a pioneer/espacio with SP3 and you'll develop a god complex in no time.
But the gun I really hate the most is the PMG, That thing has crazy range for a sub machine gun, it puts the whisper and the NTEC in some instances to shame. Pretty much a goto gun when a team don't want to admit they've been bettered so they essentially throw their dignity and skill in the trash so they can paste "gg ez" in a chat no-one reads before bed time.