Best iOS games? (rMini Xmas present)

Got my nephew a retina iPad mini. What are the best 3D full-featured games with really high production values (e.g. modern combat and infinity blade) so we don't have to rely on the app store to find us good games -- in my experience I've tended to miss a lot of great games because the app store seems to think they aren't important.

To be clear, not interested in super lame games like angry birds or fruit ninja.