Zombie U wasn't build form the ground up on Wii U it started like on ps360 as alien freaks. Ironically I liked the look of that game more lol.
The reason they didn't make money on Zombie U is because of poor management of the development.
Rayman unfortunately sold shit everywhere and as much as people hate to admit it delaying the game only pissed of gamers because majority of them don't think long term.
Before Rayman got delayed that is all Ubisoft told us about.
After it was delayed and the uproar happened suddenly they announced all those other games liek Splinter Cell ACIV and Watch Dogs.
Now call me crazy but I would take a delay plus additional guaranteed games on your system then no delay and never getting additional games. However as I said most gamers think short term and didn't see the added value and still boycotted Rayman which now has a negative impact on future Ubisoft projects.
