@mYself: Thanks for posting...I was neither aware of Zandorum, nor of Brütal Doom :) Will test soon....
@a_slacker_here: Even if it is somewhat a resource hogg, you should try out the Xonotic mod posted over here at Trisquel:
http://trisquel.info/en/forum/new-opensourcefree-fps-standalone-mod-xonotic-chaosesque-released or: http://sourceforge.net/projects/chaosesqueanthology/
