Deus Ex is one of the finest experiences in gaming. The amount of choice a player has in any given situation was super refreshing for the time, and over a decade later I'd still heartily recommend the experience. Download some of the texture packs and skill point fixes, but other than that go in blind - make your own decisions based off what you think is best and live with the consequences. There are no right answers! It's a shame the sequels weren't nearly as good.
