My system is overkill for UT3 E6850 @ 3.6 & 8800GTX SLI setup and the game slowed down way to much on the PhysX maps. On top of that the map I tried looked really bad.
(tried hte one that is not tornado related)
On a side note I also tried the warmonger - operation downtown destruction open beta. My eye still hurt from playing the tutorial. It's a beta so I can't juge it to harshly but when the tutorial makes you want to uninstall...not good.