I haven't found a good list that clearly lists the number of players.
Marvel Ultimate Alliance
Super Monkey Ball: Bananna Blitz
Rayman Raving Rabbits
Mario Strikers Charged
I haven't played most of these w/ 4 players. I am sure some do it well and some not so well.
What other games can have 4 players?
I will try to keep the list updated as more information is added.