This game is a case in point as to how "sharing" titles with the x-box can really screw the PC game over. Simply put, Deus Ex was and is one of the best RPGs ever made and certainly in the top 3 for best FPS RPG but Deus Ex 2 confidently pisses that away within a couple of hours.
DX2 lacks many of the engaging RPG elements of its predecessor. In fact almost all aspects of the game have been stripped down - there is no longer a skill set. Or an inventory and the weapons modification has been horribly nerfed.
Most aspects of the game have. Level design is far poorer, the story is thinner and attempts to make it account for all possible endings means the world seems to be rather contradictory.
While the experience overall isn't poor, the overwhelming experience for anyone that has played the original will be hollow at best. Only serving to taint the memory.