[JC Denton]

half-life was good but the objective was aleays the same...... to get out. cool for a while but far to repetative.

as for system shock 2, ive only played once so i dont know much about it, this game though did consist of many of the ideas used to create dues ex, ie training in weapons. As far as i know this was the first to do this. You could say it was deus ex's father.
i must say that de was interactive it had 5 different endings...thats if you include dieing and the secret one and many things which affect the story line, there are people to talk to and the way to complete objectives can be done differently.
Argument over.....
the fps with the least interaction though would be serious sam, no one to talk to, cant change the storyline ect., but on the plus side it did have the biggest bad guy i have ever seen, the only problem is he doesnt appear in the storyline, ie. you just fight him to win the game, you dont actually find out much about him, unlike most good fps that make you hate the baddy first.

your right about unreal tourn i would say it had the best multiplayer player. it gives you a frantic must kill feeling , which is nice, unfortunatly they forgot about the storyline. But you do need one of these games once in a while.