Having never played the original, and after the first few hours, the jury's still out as to whether I'm enjoying this or not. I had some control issues during prologue and died a lot, so that didn't help. But I'm just concerned that the game looks and feels kinda repeatative. Everything is yellow, and that's starting to get to me. And it feels pretty much like a cross between a shooter and Metal Gear Solid, which is not bad... but where's the RPG? Where's the character interaction? Where's the non-action-based information gathering and problem solving? I was under the impression that the Deus Ex series was more than just action games, but so far, after two missions, it just seems to want to throw me from one firefight to another.
The control issue I mentioned didn't help. The tutorials tend to be fairly good, but they missed something fairly important that makes this game different from other duck & cover style games (like Gears of War or Mass Effect 2): that firing while in cover mode is basically blind shooting, and you need to press Up or Sideways on the controller to poke your head out and shoot normally. I get that, that's cool, but I've never seen a game operate like that, and it wasn't completely obvious for a while, so they really should have explained it better. I went through the prologue dieing again and again... and I was thinking "this game is IMPOSSIBLE, the enemies just won't die!" Turns out, I wasn't hitting them at all. They did a good job explaining duck & cover tactics, but they missed telling you how to shoot correctly while hidden.
That aside, I do like how much the game draws from Metal Gear. They did it just right: really reward stealth tactics, but don't make it impossible to go on if your stealth efforts fail. The only problem with Metal Gear games is that often, the moment I get discovered, it's just easier and faster to just let the enemies kill me: killing everyone is hard, evading usually means losing ground, and you have to wait somewhere for a long time for the alarms to clear... faster and easier just to let yourself be killed and start over. I don't feel that way with Deus Ex. Being discovered doesn't mean impossible firefights, or long waits behind crates, it just means you go into action mode for a bit and have to change your tactics. I dig that.
I just don't know if I like the feel of it... I really get tired of games that pick a color and make all of their environments and graphics in the same shade... it feels like I'm playing a yellow Virtual Boy.
But, it's very possible that all of these things are the result of being at the very beginning of the game: intro dungeons, getting the player used to the action system before giving them some roll playing time, etc. I'm far from giving up on this game, I'm just waiting for some variety, which I have a feeling will come in time.