It was a beautiful game, if a little empty-headed.
It's basically Deus Ex with better graphics, except the concepts and game mechanics are a decade older, and not so fresh anymore. Getting back the original spirit of Deus Ex is laudable, because Deus Ex 2 really blew it, but without doing anything new what is this really but a remake?
I'm not complaining too loudly here - there's so much garbage out there, that a remake of a good game is still a nice thing. And its hard not to hold the Deus Ex series to a higher standard. Think of the difference between Half-Life and Half-Life 2; same game but they really moved things forward.
Another thing that is not so good - when I finished the original Deus Ex, I couldn't wait to start over and do things differently, even more so than that feeling you get when you finish a good book and go back to page one. On finishing Deus Ex 3 I felt like I had finished some chore, and if anything I'd rather go back and play the original Deus Ex again.