You'll defintely enjoy both Fire Emblem & Kid Icarus. Those are my top 2 retail games.
There is indeed a variety of good 3DS eShop games.
Here are the ones I own:
Mighty Switch Force!
Pullblox
VVVVVV
Mutant Mudds
Dillon's Rolling Western
Zen Pinball
Marvel Pinball
Bird Mania 3D
Splash or Crash
Freakyforms
escapeVektor
Speedthru: Potzol's Puzzle
Art of Balance TOUCH!
The Denpa Men: They Came by Wave
Crimson Shroud
Liberation Maiden
Aero Porter
Colors 3D! (Painting app)
However there are still many other good titles that I haven't bought yet such as NightSky, Fallblox, Hydroventure, The Denpa Men 2, Nano Assault EX, Gunman Clive, Picross E & E2, Harmoknight, Mario & Donkey Kong: Minis on the Move, Sakura Samurai etc.
EDIT: 3DS eShop games (EU/PAL) filtered by rating on NL:
http://www.nintendolife.com/eshop/games?region=pal&system=eshop&submit=Filter&sort=rating