So I went to the Mario Maker @ Best Buy event today. It took about 90 minutes of waiting due to the amount of people there( I was surprised there weren't more people there given the size of LA). The Mario Maker demo had an associate pick a random pre-made level for you and you had 2 tries to beat it. In addition, there was also a demo for the Legend of Zelda: Triforce Heroes that was playable as well. There was also Smash logo/ SMB 30th anniversary pins given to each person as well.
Triforce Heroes was ok, but I feel that you'd need good teammates to get through the level and there only fairy ( life) penalities if Player 1 gets killed at any time which is a bit frustrating. Mario Maker on the other hand was defenitely more enjoyable since you can do some stuff in the levels that aren't possible in other rom hacks, and the pre-made levels defenitely required more strategy than most level of Mario games. I'm defenitely gonna pick up Mario Maker when it comes out now.