Eh, MP2 was the only good game in the Mario series that would keep you enjoying it for a while (Other than Mecha Marathon which resulted in an indentation on my thumb). MP1,3,4, and 5 weren't that good. In 1 you were penalised for loosing, in 3 the minigames were crap, in 4 the CPs were retarded (I haven't lost a minigame in some 50 games, and I don't use custom-lists), and in 5 it was virtually the same deal, only this time you had a few extra characters. Anyway, back on topic, here is my severely reduced list:
Paper Mario 2
Mario Party 6 (It comes with a microphone oddly enough)
Donkey Konga (Questionable replay value)
Geist
Resident Evil 4
and.....drumroll please........
Mega Man Anniversary Collection