About the only thing more dissapointing than Deus Ex 2:Invisible War would probably have to be Daikatana.   Eidos Montreal however promises that Deus Ex 3 will be nothing like that and will try to focus on what made the first game so enjoyable.  Many sites, including Ars Technica, were given a 10 hour preview of the game and so far the feedback has been quite positive.  That is no guarantee of a good game but it does bode well for fans of the original.

"There are few games with both the respect and baggage of Deus Ex. The original PC game is considered by many to be a masterpiece, and the sequel—Invisible War—is considered by many to be one of the most disappointing games ever released. Eidos Montreal has been working on a new Deus Ex title that is part prequel and part reboot, with Square Enix as the publisher."

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