I love the interactions and characters in Kid Icarus, but everything is far too fast to enjoy it.
If you fancy something that will give you lots of hours Bravely Default and Fire Emblem Awakening are great games that you'll get about 40+ hours out of, both have demos on the EU eShop, not sure about the NA store. Super Mario 3D Land and Mario Kart 7 are pretty good for some light non-RPG gameplay. Professor Layton and the Miracle Mazk/Azaran Legacies are pretty good puzzle games.
Also the 3DS has the full access to the DS library, Here is a recommended list for
DS and
3DS games.