Well, I might be the first one here who really liked the demo. I was a big fan of the first game too. This is alot different though.
The first 5 minutes of playing the demo I thought it sucked. Sucked hard. Then I found out new things and got more used to controls/features. I personally don't see that it was "dumbed down" like everyone says. Yes, it clearly IS made to work on a console as well, but I don't think that automatically means its been dumbed down. The graphics amazed me. Alot of people have had problems with them but they looked fine to me. Shadows and lighting were both done extremely well and models were good enough. Not great but certainly everyone you meet looks very unique and easy to tell apart which I really like. Everyone has their own style, it's not just different shades of white/brown.
Talking to everyone you can see how much depth is in the game. Everyone has alot to say. A hell of alot.
Anyways, I was very impressed. It's not as good as Deus Ex 1 was in my opinion but it's so much different as well. I had alot of fun anyways.