I have found a couple games which I think are good. "Pyramid Rising" which is a time management game like "My Kingdom for the Princess" on the iPad, "Great Little War Game", "Dead Trigger", and "Dungeon Hunter 3" all seem very good to me. It is hard to get used to the small size but it is such a nice machine so I am crossing my fingers for lots of great games.
Dungeon Hunter 3 is absolutely awful...avoid it at all costs. Play DH2 instead if you're really in the mood for a mediocre hack-n-slash.