Origins and the demo were great. That does not mean the game itself is great, just the part they showed.
I have to ask, have you ever played Rayman Origins, or even the Wii U demo for Legends?
I assume they realised it was shit and decided the best way to go ahead was to use this as an excuse to do an extra 8 months development, using multiplat as the reason. As opposed to releasing a shit game now that will crash and burn.
It is anything but shit ... you sound like a classic case of sour grapes to me!
The 'Castle Rock' sequence (on the demo) is the single best thing on the Wii U, full stop.