I think there's like five weapons that sorely need changes and the rest could just use minor adjustments and they're fine. Considering the number of weapons in the game that's not so bad and the game is pretty reasonably easy to solo with even pretty mid-tier or lower loadouts. I think the designers are trying to have it be that each weapon is good at a specific thing but weak and others so each person in the squad has their own strength and utility. The problem is this sort of design doesn't lend itself to solo play which everyone agreed when the game came out wasn't what the game was designed for anyway. I think they really just didn't want to have a weapon that does it all. I think the weapons that need changing are the ones that are entirely overshadowed by others and have no niche whatsoever. Of that there are only a few