Enter The Matrix
-I find the Training construct incredibly fun, I love the fighting in that game
Dynasty Warriors 3
-Playing split-screen manages to overshadow the repition, getting all of the content makes for an almost unlimited amount of replay value, and an inscentive to keep playing
Metal Gear Solid 2
-Finding each dogtag is compelling, and worth the extra challenge
Metal Gear Solid 3
-Fighting "The End" is a remarkably unique experience, that I love playing again and again
(Puzzle Games,Fighting Games, and other Multiplayer games are excluded)