User creations are going to be awesome.
My track from the beta:
https://www.youtube.com/watch?v=YXj3zkzjR2c
Every lap parts of the track crumble away and fall into the lava.
I don't like the overly crafty look, it creates an artistic bottleneck. The game should still retain the craft look for people that want to make levels that look like they were made out of stuff pulled out of a waste bin, but people that want to make more realistic worlds or their own artstyle shouldn't be left out. If you want a level to look like it was made out of cardboard, it's still more than possible. It's harder to not make it look like cardboard.