Holy god of necro...You just bumped a 13 year old thread.

Anyway, I consider freezer the worst. It's too niche (its uses being freezing springs and using over death pits, the robot bug on freeze was stupid and I'm glad it got fixed), it's mostly just a glorified blaster. Not to say I hate the weapon, I like utilising it in levels. I just wished it behaved more differently than blaster and wouldn't let players to break out of it themselves.

TNT is buggy (I think?), though it can be useful for playing defensively. It's nearly just about as niche as freezer, though.

Pepper is also niche, too bad the powered version doesn't give more damage by default.