"I happen to like Invisible War. The Xbox version was better than the PC version from what I have heard."
Well, like I said Dean, I only played the PC demo, so maybe it isn't fair for me to judge the game based on that, but from reading the responses of others on the web, the problems with the demo were NOT improved when the full version was released ... and some of those problems - in particular, very inconsistent frame rates - turned out to be even worse in the xbox version, according to the reviews I've read.
I think I wouldn't have been so disappointed by the PC demo if I hadn't loved the original Deus Ex. I thought it was a terrific, ground breaking game. I wasn't expecting the demo to actually improve on that experience, but I was expecting it to at least match it in terms of graphics and frame rate, etc. But it actually looked and played worse than the original IMO. There seems to be a problem with the engine Ion Storm created for the game, as the new Ion Storm Thief game on the xbox, using the same engine, is also said by reviewers to have serious frame rate problems. Nothing takes me out of a game faster than watching everything suddenly turn into a slideshow ...
I'm not going to tell you you shouldn't like Deus Ex, Dean. (If I get a chance, I'll still give the full version a spin on the xbox, just to see if the game play can overcome some of the technical problems). I was just surprised, based on reading many reviews and my limited hands-on experience with both games, to see someone say that Deus Ex was superior to Riddick. I have yet to see a single negative review for Riddick, and most reviews have been very glowing ("a must have game on the xbox," etc) while the critical reaction to Deus Ex was far less unanimous. And I think it's safe to say that, strictly from a technical standpoint - graphics, frame rate, etc - Riddick easily bests Deus Ex.