Elite on my BBC Micro B (Beeb). Then Barbarian came out with 8-colour graphics along with Repton which had it's own level designer.
Then I got the Amiga 1200 and it was Combat Air Patrol - my first taste in a proper flight sims, along with Cannon Fodder, Sensible Soccer, Beneath The Steel Sky and Gloom (Amiga's take on Doom).
After the death of Commodore, I got a PC and was wowed by DiD's TFX & EF2000, Jane's AH-64 Apache, DI's Hind, Janes ATF and a demo of Duke Nukem 3D. - It was seeing textures on a polygon - a rare glimpse of the future of computer gaming.
Then came Quake - proper 3D modelled graphics & animation, followed by the beauty of Red Alert & Dark Reign which still held the flag for 2D games.
Finally we came to Quake 2, Commandos, Half Life, Falcon, Diablo 2, Medal of Honour, Call of Duty, C&C Generals, HL2, Oblivion and finally CoD4.