My Fav 2 old games are Command & Conquer: Tiberian Sun with Firestorm Expansion Pack and Final Fantasy VII on PC.
The first game I remember playing was Ghostbusters on the Commodore64.. loved that.. After that my favorite was always the ChuckYeager Flight Simulator. I was never any good at flying though.
And then of course, on the PSX I loved Syphon Filter. I think that was only because I liked tasing the bad guys till they caught on fire. I just looked up a video of it and can't believe the graphics are what they are.. I remember them looking so 'real'.
My favorite is Prince of Persia 1 & 2 also i loved wolfenstein3D Hexen, Blood, Heretic, Commander Keen. Alley Cat was also cool. really good memories, thats why I got dosbox, so i can keep playing them.
the first game i ever played was prince of persia 1, on a 386 with 1 mb of ram.. it is what got me hooked on pc`s.. graphics may have improved beyond recognition since then, but the fun of gameplay is more dependent of the idea of the gameplay, not the graphics..