I haven't played most older games so my list would be too long. I'll just hit the highlights (note, I've played at least a few minutes of all of these, but that's all)
System Shock
Bioshock
Deus Ex
all GTA
Thief
original Doom
Dishonored
I have a hard to describe standard as to whether I've played a game or not. If I reach a certain point in the game, I usually feel I've played it, as opposed to just going in for 30 minutes and never coming back. I've never, for instance, finished Half Life 2, but I got to Ravenholm and feel like I played the game
System Shock
Bioshock
Deus Ex
all GTA
Thief
original Doom
Dishonored
I have a hard to describe standard as to whether I've played a game or not. If I reach a certain point in the game, I usually feel I've played it, as opposed to just going in for 30 minutes and never coming back. I've never, for instance, finished Half Life 2, but I got to Ravenholm and feel like I played the game