Techgage listed Nexuiz in it's top 10 Linux games:
http://techgage.com/article/top_10_free_linux_games/5
Number 4 on the list.
Requirements:
* Has to be 100% free... no strings attached.
* Cannot require wine to run.
* Open Source not a requirement.
* Installation must be painless.
* Cannot be an add-on to a commercial game.