The waiting list was full when I got there so I didn't get to play anything. Also all the Luigi Hats and Mario Kart flags were all gone :( but the most frustrating thing of all was that half the people there wanted to play Zelda.
So you had to watch a single player play the same Wind Waker level that the previous nerd played, for 10 minutes each. Note to Nintendo... you have four controllers and a crowd of people wanting to have fun. Watching one person play an old Zelda game repeatedly is not fun.
I did get to see Super Mario 3D World played a few times, which was awesome. I'm really really excited about it. Mario Kart 8 looked great too, even though it's just more of the same. Donkey Kong Country was also more of the same and had really bad loading times (I assume they'll fix that before release). In fact DKC looks pretty underwhelming after playing Rayman Legends.
So if you have a best buy nearby it's worth checking out (they do it again Saturday), but be prepared to wait a long time to get play.
Pikmin 3 and Smash Bros. would've been halfway interesting
my friend and I went there and there was like a 8 person line it was awesome, we convinced them to let us play half-sessions of mario kart and Mario 3D World consecutivley. I had a awesome time and got a flag( the hats were wiped out though). Mario 3D world was alot more than I expected, and Mario Kart 8 felts great. Like it just felt good. I had a awesome time and got a ton of streetpasses.
though it DOES look a bit like him during that several month mountain hiking trip he did