Here are some games that I know would work on Ouya because I managed to get them working.

The Dark Knight Rises
Injustice : Gods Among Us
FIFA 15
Deus Ex : The Fall
Telltale's Game of Thrones

These are the equivalent of AAA games for Android, a category that Ouya is lacking since Telltale decided not to port the Walking Dead series to Discover. If Ouya Inc. wants more sales, it's definitely the kind of games they need to secure. There should be an option when you call the menu from a sideloaded game (or app) to ask for a port. This would send a log to Ouya engineers, proving that the game works and they could let the developper know how easy it would be to port their game.

Heck, if the dev don't want to bother they could even offer to port the game themselves like they did for Towerfall Ascension. They can do as they want but we need more mainstream and AAA games.