I've never met an Amiga that I didn't like. They are all still fantastic, can do almost anything (Never owned CDTV, CD32, or a 4000). Amiga was my first general purpose computer with a real OS and large spectrum of applications and abilities.
Some computers that put me off:
Timex Sinclair - cassette tapes and crude graphics
TI-99 - every l e t t e r in a text stream was a different color, rediculously expensive expansion, limited apps.
8-bit Ataris and Commodores - toy-like OSes