I think it's rather humorous that some fanboys talked up how much the PC BioShock would steal sales from the 360 version and are now touting UT3 for PS3...
I hate to break it to you but UT3 is one of the hardcore games for PC FPS gamers. Up until this point, the franchise has been entirely on the PC and all leagues, tournaments, etc. are set up for that style of play. Don't expect ANY of these players to jump ship to the PS3.
UT3 will sell decently but don't expect any earth-shattering sales numbers, especially when you factor in Halo 3 and BioShock on the 360 side of things, two games that are better suited for the console (Halo being a console-first shooter and BioShock lacking multiplayer).
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