I loved this game, never bought into the later editions. I remember the character generation was top notch, flow-charts, long before Mothership.
First couple times playing usually ended in a TPK in the first encounter. We didn't know what we're doing. Even though I was technically the GM, I made characters too and played along with everyone, and died along with everyone, the sandbox nature was unlike anything I ever saw, and at that point I was well experienced with D&D (holmes, bx, to Advanced) and tons of other games, GDW, West End Games, Hero/Champions, GURPS, and everything TSR. Back then we read, made characters, and designed stuff more than we ever played. But Twilight 2000 was a stand out.