If you played the original Deus Ex, stick with that one. This game deviates too far from the engaging and unique environment created in the first. Small levels, long loading times and uninspiring levels make for a boring game. The only reason I stuck with it was the hope that I would find out more about what happened after the first game, story wise. Even that was fairly dissapointing.
Graphics were good (lighting especially so) and most of the sound work was good. Needed more polishing and tweaking before being released, however.