UT2004 is probably my favorite release of the CY2004. It's as close to perfect as any fps I have ever played... I find myself playing this more then the Ryzom or Lineage II betas that I am in. This is a very surprising statement coming from a guy that normally is a pretty hardcore MMO player with little interest in fps games.
UT2004 just does something for me. I think it's the inclusion of the vehicles that make it so damn fun! There are now more strategies then just about any other fps title out there save BF1942....
Over all, a great game, though I have run into a few snags playing online with lag, but that's to be expected...