My biggest gripe is the slippery controls on the 3DS. I didn't feel like I had control over Rayman. I bought the game on Steam and play it with an Xbox controller, and that version is fantastic. 3DS version was crippled beyond any hope of getting a good score.
I've played side by side both the PC (with gamepad) and 3DS versions, there's no difference in how Rayman handles whatsoever. Same response time, same friction, nothing has changed in terms of the controls. I also have played the Wii version as well, which again controls the same as the others. So I disagree that the 3DS version feels any more slippery than the others. The game itself has a certain level of momentum you have to get used to during the first few minutes, but this is true of the game itself and all its versions.