Lately I've been pouring time into the HD Windwaker remake and Wonderful 101.
Windwaker is even more beautiful nowadays, and the speed sail is a gift from heaven. Wonderful 101 is really fun once you start to get the mechanics of the game down. It doesn't do a good job of explaining the subtleties of the battle system, but I've always liked figuring things out on my own. Beyond that, the cheesiness of the game is endearing to me.
So, what are you all playing?