When I got ahold of that book, I made character after character, progressing through the careers. I don't think we ever ended up actually playing it.The first non-D&D fantasy RPG I played was probably Empire of the Petal Throne. I seem to recall discovering that I couldn't play a dwarf, but could play some creature with three legs, three arms, and a lot of fur and thinking "what is this garbage?!" In my defense, I was quite young.
First non-D&D fantasy RPG that clicked for me was Warhammer Fantasy Roleplaying. The GM wasn't very good, but the grim and perilous world, the career system, were completely enthralling.