Got to be honest the frame rate is pretty slow on this. I just got the Wii U version in a sale, and it's a bit rough. It's probably ok if you are not used to the higher level graphics but it just looks slow. It's not so much slow down as I don't see it ever running smoothly, it just looks consistently slow. Not unplayable though.
Also the shadows are shockingly bad, and make it look worse than it would otherwise I think. When it's still it looks fantastic, but throw in awful shadows and slow frame rate and it doesn't look that good.
It certainly doesn't look like they prioritised performance at all after what they said about it.
It is slow. It runs at about half the frame rate of most other wii u games (or wii games... or nintendo games in general...) like pretty much every multiplat ps360 game I have. But we are specifically talking about dramatic performance slowdowns, like shown in the video... The likes of which ive never encountered so bad.
All ubisoft wii u games except zombi u have horribad shadows, as the wii u is basically emulating a 360 in their ports, whose code was designed to use only a meager 10Mb of edram, and use main mem for everything else, and thus take horrible samples whilst wii u has over 3x that on die... Anyways, we all know ubisoft didnt waste time or manpower on wii u ports, they simply give the system 360 code and let it trudge through unoptimized code.
What they did do, was add things like vsync, slightly higher res textures, and slightly better effects over ps360 versions. They didnt attempt to opimize performance in the slightest upon release, although they did patch it after release, which helped a little bit. Did your version get the patch yet?