The game has only been out for a week and a half, it will take a little more time to build up a playerbase. The system requirements are also higher, which may be dampening sales. The game itself is good and runs fine for me.
Devster, if you use the latest IntelliPoint software for your mouse, you can use it to assign mouse buttons for specific programs. For example, my fifth mouse button is assigned to F12 for UT2003. I-game, I assign my TL to F12 and it works fine with the mouse. Built-in support would be better, but this works and since it's program-specific, it doesn't affect anything else.