A lot of people act like the 3DS library is pretty bad, but is it? I mean, there are games coming out in the future and that are out right now that are pretty good. I can't say that out of person opinion since I haven't play any but I can go off of general opinions. Some are -
Mario Kart 7 - Mario Kart with new tracks, characters and customization.
Super Mario 3D Land - Awesome Mario games that combines 2D and 3D Mario well.
The Legend of Zelda: Ocarina of Time - One of the best games ever made, remade!
Star Fox 64 3D - Not that long but still a really good game.
Ghost Recon - A good tactical turn based game.
Devil survivor Overclocked - Good RPG game.
Pokemon Rumble blast - Decent non traditional pokemon game.
Now, that isn't a ton of games but they are pretty darn good but what everyone is waiting for is the upcoming games -
Paper Mario 3D
Super Smash Bros 3D
Kingdom Hearts: Dream Drop Distance
Resident Evil: Revelations
Snake Eater 3D
Luigi's Mansion 2
Future Nintendo franchise games (More Mario, Zelda, Metroid etc)
So why do you think the 3DS isn't as a big of a success as it could of been? It will likely gain more attention and sales but how about now? Also, do you think the Vita will do any better?