My son just got Mario 3D world. Its pretty good. imo, because its 3d, it can sometimes be difficult to control the character, but doesnt detract from the game at all. If you like Mario, then you will like this. Also my son (6yo) likes Nintendoland. Not super awesome mini games, but some are fun. and also the Lego games. Cant go wrong with those. Disney Infinity is pretty cool.
*sorry all games for younger audiences...but my kids are 6 and 8.