
The main reason why I didn't like the 3DS as much as the DS is because I'm blind in my left eye and couldn't see the 3D effects. But otherwise I loved the handheld. Kirby Triple Deluxe, Planet Robotbot, A Link Between Worlds, Super Mario 3D Land, and so many others.
I think the best unique thing about the 3DS was the StreetPass feature. I loved taking the 3DS with me everywhere and StreetPassing people. It made going to conventions like E3 and PAX extra fun because you got to StreetPass a lot of people. I loved the games they made for it, too. Only problem was it was made for densely populated areas in mind (like Japan), so my friend and I would arrange StreetPass meetings at local GameStops back then, which was a lot of fun, too.