This is a total fail on Sega/Nintendo. I played the first one Sonic vs. Mario Olympic games on Wii and heard that they continue to be terrible with every version.
I tried out this demo and boy it turned me off from ever playing the retail game.
The controls felt awkward and 3d was pathetic and the mini-games were just NOT fun.
I didn't even enjoy the BMX one because I worried too much about moving my 3DS in that motion it wanted,and that action kills the view so it's all bad to me.
Played the demo and DELETED it off my SD card.
Nintendo and Sega are ONLY doing this for money, they could make a fun sports game on 3DS with features. Using Gyro to shoot would be fun, flicking the soccer balls with touch screen would be better, and the trampoline is pointless, the bmx should not have the waggle mechanic.
Awful, Awful, Awful