My top picks, in order, are:
1. Shin Megami Tensei IV - Before I bought this game (I did so because it was on a best of 3ds list from IGN), I had never heard of Atlus or SMT besides the Persona series, from advertisemants and forumites. That being the case, Atlus and SMT are now among my favorite companies and game series, respectively. It's like a mash up of the gameplay of pokemon and the 3rd person look of Mass Effect.
2. Fire Emblem - I just got this and I am already addicted to it. I have never played a game like this before (I almost didn't get it but the recommendations from friends and the reviews online were too much to ignore). There is a demo but I wouldn't judge the game solely on it because I played it before I bought the game and was like, "what's all the hype about?". It's a tactical party based jrpg and it's fun as hell!
3. Paper Mario Sticker Star - Turn based Mario goodness with a gorgeous 2d world and a hilarious script.
4. Animal Crossing - I am a 28 year old man and I shouldn't like this game but I do. It's hard to say if you'd like this but you could always watch youtube gameplay vids.
5. Bravely Default - I have only played the demo, as it's not out yet. but I absolutely loved it. Check it out if you like old Final Fantasy-like JRPGs (though I hate Final Fantasy lol).