As much as you can hate the brand, you have to give respect to a bike that was innovative is some way or another
I don't like Trek, but I respect the OCLV bikes. There were few that were lighter. And they were strong (enough). And made in the US.
I hate Proflex, especially for their use of elastomers, but I have to give some respect to that silly fork. It's good that someone took the time to rethink wheel path on a bike, even if it wasn't implemented well.
I think Slingshots are ridiculous... but one of the earliest full-suspension bikes out there.
Softride... ok, those bikes are just stupid. The stem was a good idea before suspension was available, but the beam?!
Canondale headshock... just in case this sport hasn't crushed enough testicles already, Canondale decided to raise the top tube. Besides, rebuilding them is a nightmare.
High-end bikes that cost a lot of money simply because someone didn't take the time to figure out a way to make them inexpensively and use obsolete technology or simply break. Ellsworth comes to mind.
Expensive anything that comes from Asia.