I watched my roommate playing the demo, and maybe this is just because I was able to sit back and watch without being immersed, but I couldn't help but notice a couple of detractors:

-There are invisible walls. In other words, in a city full of buildings they could have used to block access, they instead decide to slap down a giant magic wall out of nowhere to prevent progress in a direction.
-Combat seemed cool at first, but then all the realism was kind of shattered for me when three guys with machetes just stood around and waited to take on the player character one-by-one instead of circling and overwhelming him when he took a swing at one of them.
-Story seemed a little implausible/maybe it was just bad writing.

Apart from that, I would agree with froggy. I do hope they get rid of the invisible walls - if they did that I'd totally buy it. Something about that just ruins the aesthetic of the game for me.