I'm warming up to the game's engine. Gaming physics engines are like buying socks that fit a wide range of foot sizes; some will fit you better than others. My most favorite ever is the Half-Life engine, and its a joy to move amongst other games with the same engine, such as Team Fortress and Portal, because it feels like there's no learning curve. When you can slip into a new game like its an old pair of broken-in shoes, any game you play that doesn't fit as well is going to hurt by comparison.
Recently in Fallout 3 I often felt mismatched, like my character was almost too short and the world was too big; which could be somewhat fixed in third-person view. Sadly, the original Deus Ex always felt like characters were floating a few inches above the ground, and not quite in the environment. The current Deus Ex feels better, but there are still some size and spacing issues.
I'm already wishing I could see Deus Ex original ported to the Deus Ex 3 engine. I wonder what its going to be like to play the original again, considering this is a prequel and looks so much better then the future in Deus Ex original (like the Star Wars prequels).
I wonder if there will be a mod scene.