I have to say that I hate some brand's time periods.

I had all stingray's growing up, and I can't stand them. Yet those and all the other heavy Chicago Scwhinn's are built like tanks and can be rebuilt over and over.

Late 80's and Early 90's Specialized. Narrow lower stays, that no tire over 1.9 could fit through.

Anything glued, epoxyied, etc. That would include Technium (Raleigh), Trek Onyx and early carbon, Specialized, etc.

Trek after giving up on US manufacturing. I love any of thier lugged stuff.

Fuji's, not a fan, any year. Though my first mountain bike was one, heavy and poorly designed.