Lara Croft and the Guardian of Light - My cousin and I played through this and had a very grand time.

Scott Pilgrim VS the world - A side scrolling beat em up, very fun with RPG aspects, only 800 MS points.

Dead Nation (PS3) - Another great game, shoot em up with RPG aspects, no fighting over money in this game, it is a fantastic idea!

I would recommend all 3 of these games to anybody.