Lemmie give you some categories...
Acoustic amps - My Laney LA30. It's not that bad of an amp but for a while I didn't have a "real" amp and drove it's speaker to distortion. I'm sure it's torn and gets this "amazing" fuzz tone.
Bass amps - Samick 20 watt bass amp at school... worst sounding thing I've ever heard. No good sounds, too quiet, ugly...
Tube amps - Hated the Mesa 22, hated the Valveking (sorry) HATED the Marshall Haze. Terrible sound, in my opinion but maybe they were just me.
General guitar amps - I don't really like Roland cube amps... you've got Jazz and Shred and nothing in between. They're not that bad for certain tones but they bug me.
