I own 12 3DS games and have played the majority of them so i'll tell you whats worth your time and whats worth passing.
The launch didn't have a ton of huge names but has a ton of depth.
Must-Buys
Tom Clancy's Ghost Recon: Shadow Wars
Super Street Fighter IV: 3D Edition
Dead or Alive: Dimensions
Pilotwings: Resort
Ridge Racer 3D
Get It If You Like The Genre
Samurai Warriors Chronicles
Nintendogs+Cats
Steel Diver
Pro Evolution Soccer 2011 3D
LEGO Pirates of the Caribbean: The Video Game
Dream Trigger 3D
LEGO Star Wars III: The Clone Wars
Only If You Love The Genre/Cheap Games (Buy 1 Get 1 1/2 Off, Clearance, etc)
Bust-A-Move Universe (priced too high)
Rabbids Travel in Time 3D (really surprised me, solid but very easy platformer)
Madden NFL Football
Rayman 3D (how many times has Ubisoft re-released this?)
Crapware
Tom Clancy's Splinter Cell 3D (terrible controls ruin an otherwise great game)
Combat of Giants: Dinosaurs 3D
Asphalt 3D
Sims 3
The launch didn't have a ton of huge names but has a ton of depth.
Must-Buys
Tom Clancy's Ghost Recon: Shadow Wars
Super Street Fighter IV: 3D Edition
Dead or Alive: Dimensions
Pilotwings: Resort
Ridge Racer 3D
Get It If You Like The Genre
Samurai Warriors Chronicles
Nintendogs+Cats
Steel Diver
Pro Evolution Soccer 2011 3D
LEGO Pirates of the Caribbean: The Video Game
Dream Trigger 3D
LEGO Star Wars III: The Clone Wars
Only If You Love The Genre/Cheap Games (Buy 1 Get 1 1/2 Off, Clearance, etc)
Bust-A-Move Universe (priced too high)
Rabbids Travel in Time 3D (really surprised me, solid but very easy platformer)
Madden NFL Football
Rayman 3D (how many times has Ubisoft re-released this?)
Crapware
Tom Clancy's Splinter Cell 3D (terrible controls ruin an otherwise great game)
Combat of Giants: Dinosaurs 3D
Asphalt 3D
Sims 3