Although I encountered a few other games, the ones I actually played regularly were:
Melee/Wizard
Classic Traveller
Champions/Justice, Inc.
Toon
Monster Island
I must be the only gamer alive who didn't cut his role-playing teeth on any version of D&D. Sat in on a session once, years later. My paladin got killed in the first 15 seconds. Didn't exactly whet my appetite for more. THACO? I just don't get it.
As a Hero System fanatic, I never saw the point of GURPS. Liked the multitude of campaign supplements, though.
I actually wrote a campaign supplement for Rolemaster, and I
still didn't get it. I suppose having a group of Shadow World fanatics as gaming buddies would have helped.
Games I'd like to try (looking for something simple to play with my kids):
GORE
Risus
Plain-English Role Playing
Action! System
Faery's Tale
Always thought the back story for Candyland would make the basis for a great fantasy campaign. I mean, you've got a missing monarch, a kingdom in crisis, strange locations, monsters, a board full of suspects, a moustache-twirling villain, and all the bitter chocolate bats you can eat. What's not to like?