My name says it all:
BLOODWYCH is THE all time best!!!!!
Well, as long as you have a friend to accompany you on the quest
If not, one of the others above are good I suppose
Bloodwych has to be one of the most underrated games of all time. It's unique in that it's a 2-player RPG and although it has a one player option, it only truly shines in split screen mode.
I've written posts on this fabulous game before, so while I go and dig them up (if they're still around) have a look at this site:
Bloodwych, for those who dare!