The game, as a whole, was very unpolished. This is because it was built on a previous game which was changed. The turn around time from the old game in development (killer freaks in outer space) to ZombiU was about a year, and people cannot expect Ubi to present a perfect game in this time. But i can see how people who are a little less in the know about the Video Games industry could be put off by this.
I, personally, loved the game as a new IP. felt is was very ambitious, considering all Zombie games at that time were just generic FPS with zombie skins for enemies.
Would love for them to bring a second one and i can see it being Multiplatform (if it is made), but as a Wii U owner i would not be angry about this, or boycot the game like i know many would. I dont care what is exclusive and what is not, i just care about the games i want to play and will buy, and Zombi U 2 is definitely a game i would pick up.