You are not alone. 

I hope that we will get some questions answered in AA5 though.

My must-have games are
Kid Icarus
Theatrhythm Final Fantasy
Tales of the Abyss (was a PS2 game so it probably doesn't count)
Kingdom Hearts 3D
Etrian Odyssey IV (the demo was just too fun)
Fire Emblem: Awakening
Ocarina of Time 3D
Mario Kart 7
Paper Mario: Sticker Star

I got Dead or Alive because it was interesting

I grabbed Harvest Moon: A New Beginning because it was $29.99 on Amazon.

edit: I forgot to mention some e-shop games.  

Link's Awakening
If you like drawing, Colors! 3D
Pushmo
The upcoming Harmoknight
and I can't think of more on the spot.

I thought we were talking retail only

Eshop has Dillons , Liberation maiden, Crimson shroud and many excelent little games in the 2/10€ range.

Fire Emblem
Fire Emblem
Fire Emblem
Fire Emblem
Fire Emblem
Fire Emblem
Fire Emblem
Fire Emblem
Fire Emblem
Fire Emblem

Probably the biggest must have:

Super Mario 3D Land
Ocarina of Time 3D
Mario Kart 7
Fire Emblem: Awakening
Kid Icarus
Resident Evil: Revelations
Luigi's Mansion 2
Animal Crossing: New Leaf
Pokemon X&Y
Monster Hunter 4 (when it comes out!!)

Ace combat is pretty good also, you shouldnt dismiss Starfox 64 and Zelda Oot even though theyre remasters, and you should get them like NOW if you never played them...

I watched Fire Emblem's review on GT and I'm still not sure what the gameplay is really like, but if it's more RPG than strategy it'll be fine.
I also looked up Kid Icarus and no offense, but the game looks pretty crappy to me.
I won't play RE Revelations because I don't like playing shooters with one analog stick. I tried out some on the PSP and I always fails to complete them because they were so akward to play.

So thanks to you all guys, you were a real help. You gave me so much answers that I don't really have time to check all games out, but from what I've found out so far the 3DS has a really interesting library already. I think it's definitely worth it. I'm gonna stick with the Vita some time till I really got nothing interesting or worth buying (PSN+ kept me playing for a few months now) and then I'll go for the 3DS.

Updated list so far:

Games I'm most excited for are SM 3D Land, Zelda OoT 3D (never played it) and Yoshi's Island (was my favorite game as a kid) :)

even though its not coming intill either 2014 or 2015 but SSB4 will be F-ing Awesome

Wow, I didn't notice your post till now, somehow, but this is great!! Thank very much!!