i cant agree with MGS2, but i can with GTA3
MGS2 is a game that you need to have patience for, and LOTS of time on your hands (which is rare because its quite short)..
you obviously like shooters, and fast paced stuff.. this is not for you
but if you like a bit of variety, and are willing to experiment with it, it will pay off
TimeSplitters 2 is out in a few months, keep your eye out
Red Faction is a good shooter, Half life is nice, but you would probably rather play on PC (multiplayer etc.)
Quake 3 has good multiplayer as well
but if you MUST get something good that you are guaranteed to like... TWISTED METAL: BLACK
everything you want..
and IMO its the second best game on the system behind MGS2