I don't know why people are so bent on saying how something sucks without even seeing it.
Maybe people were expecting too much, all this pack does is pile on more content for a game that gamers, on the whole, aren't too interested in playing. The problems with UT3 are much deeper than just a tweak to the UI and a few extra maps can fix.
Personally, I found the art design to be a turn off - too dark, too Asian, and too bulky. They lost the sleek Sci-Fi feel from UT99 along the way. Aside from the hoverboard the vehicles aren't all that fun - having almost everything 3rd person view is too arcadish for my taste, and the physics and handling are lacking.