Those were my first impressions too but unfortunately by the end of the game it becomes clear that it has been very rushed to meet the console release. The amount of actual content in the game is very small and the last few hours are obvious padding, to the extent that it takes away all of the shortcuts you've previously found to make you go the long way around.
Seriously, its excellent. I had zero expectations going into it, i was fully expecting a basic zombie game with some gimmicks thrown in with the GamePad.
The truth is, the GamePad works perfectly and the game is genuinely terrifying - the tension that runs through the game is ridiculous.
ZombiU is a proper, genuine, class game.
The ending is shit too.
Lastly, I am gay, disabled, and a liberal.