Jack the Potato said:
Now, I don't believe Deus Ex's story completely because most of it revolves around the Illuminati existing, which they don't in real life, at least in the sense that Deus Ex portrays them.
To be honest to the game, somebody said ingame (I believe it was Sarif or Taggart himself), when you sarcastically say, "The illuminati? are you kidding me?" he answers, "That's one name people call them, otherwise the Bilderberg group or the NWO, it doesn't matter, they have no real name."
It's also not ever said they had direct complete control over the world. They however could influence and steer sort off in the way they wanted, which isn't exactly the same.
That's what they're doing in the game plot. They are steering the UN to enact a law they want. That is not direct control or world domination - it's influencing.
I also think the main reason to become a cyborg is to achieve a certain immortality, right? Why else would you want a metal body?