And for the record, I aways thought that deus ex was more a spiritual sucessor to SS 1 and 2 than BS ever was.
And what does DX have in common with SS?
Apart from being in first person and there being guns in it? Glowing blue hi-tech sword?
I said that considering the term "spiritual sucessor" somewhat a subjective concept that I myself don't rely upon. Either you have a sequel, or you have a clone. There really is no such thing as a spiritual sucessor.
The fact that I feel Deus ex is a spiritual sucessor was more due to the fact I felt that after playing SS 2 and heard the news they were going to release Deus Ex. Deus Ex was not a common FPS by the time it was released, as SS wasn't too. In late 90's, FPS were games like Unreal, Quake, pure action FPSs. And after SS2, Deus ex was the next game by the same kind of group of developers that came from origin systems and LGS from Ultima Underworld days.
Deus Ex also had similar Thief stealth mechanics and incorporated similar gameplay of LGS games, like leaning, objects that can be dropped in one location and they would stay there if you go back to that area. It's funny also because SS2 uses the dark engine. The inventory system is somewhat similar in SS2 and Deus Ex. And both have strong cyberpunk themes, advanced artifiacial inteligence (Shodan, Xerxes, Helios, Daedalus), similar gimmicks, like hacking (bioshock had too, but is more like a copy, and it was more a plumbing game). They only differ in the genre approach, Deus Ex being a government global conspiracy, and SS fllowing a sci-fi horror adventure. And in Deus Ex, you had alive NPCs.
Another thing is that both SS2 and Deus ex were sold in their times as full RPGs, something people here and everywhere now avoid, calling these games FPS with RPG elements. I can even accept people calling SS 2 and Deus Ex RPGs, but I can never feel the same way about BS.
There's an interesting thing about SS2, that it had stats and weapons that would break, Just like an Ultima Underworld game, and the first SS, although used the UU engine, didn't really had any of these features.
BS is more like a bad copy of SS 2, to the point that the villain pretends to be your ally and guide through the game, just as in SS2. Made by the same guys by the way.
Finally, the pleasure I had playing SS 2 and Deus Ex were quite similar, and while I finished bioshock, the only thing I really remember is that BS is mostly boring.