If you liked the original, you'll like this one. This is the only real sequel to the original Deus Ex, even if it is a prequel. Invisible War never happened, y'hear?
Well... except for the achievements. I really don't like those achievements. In the original Deus Ex, you could go through the entire game without killing, if you slightly glitched one of the bosses. It became an emergent feat of honor to go entirely murderless through the game and you couldn't even prove that you'd done it. It was just a result of excellent game-design that an FPS game allowed you to go non-lethal routes almost everywhere and players rejoiced in it. Now? It's a freakin' achievement. Beyond those of us who played the original and ran the non-lethal route just because we could, the majority of non-lethal players this time around wouldn't even have considered it without the achievement dangled in front of them.
Basically, achievements cheapen all the things you've done to 'achieve' them.
In short, I'd like to thank the mouthbreathing masses for jumping on that particular aneurysm inducing bandwagon of failure, forcing developers everywhere to scatter nonsensical and worthless little affirming tidbits around the games just to appease the e-peen rubbing turds who wouldn't know real achievements in games unless it was rammed up their ass with a nifty little icon.