Of the "sneaker" shooters, Deus Ex fills the shooter side well. It offers better weapons then the rest and a better open ended feel than the others. This alone makes it interesting to play. Downsides are its "cheesy" dialogue (which i sometimes find amusing and cool!). A worthy upgrade to the Ultima Underworld, Thief, System Shock type games... which we lack (and should have MORE of) these days.