Gotta agree with you on Deus Ex. I played it for the first time, last month. It was a masterful game with a great storyline. It seems today's games focus so much on eye candy at the expense of compelling storylines.Three came to mind immediately:
2) Deus Ex
3) Divine Divinity
All of those games were fucking incredible, and Deus Ex and DD are still supremely enjoyable today despite being years old.
1) Starsiege Tribes - Excellent game, predecessor to many modern fps games in many ways.
2) TIE Fighter Series - Too bad this genre died out really, these games were superb.
3) Civilization Series - More addictive than crack, need more be said?