Get Ghost Recon at Target for $17. (Especially if you are an advance wars fan.) I played it late into the night yesterday, and am now trying to stay awake at work. It is a turn based strategy game of sorts. The 3D doesn't add too much to the game play mechanics, but adds a lot to the aesthetics. It almost feels like you are moving players in a diorama setup on your table. This is not just a game one buys early in a system's life because there are no others (though I will admit that is why I bought it ). It is a good game, period.
I just wish they would release a new Advance Wars. I'd buy 5 3DS units out of happiness lol.