I run Gentoo Linux as my primary OS and this is my experience so far:
* GREAT installer: simple, fast, and gets the job done.
* Game launches without linking errors... always love that.
* At launch I was not asked for any information, the game just defaulted to full screen, native resolution. This should have been fine-- if I didn't run NVidia TwinView... Sadly for now I am running it in a window at the only other resolution available to me: 800x600 (this could be because of my X cfg file... haven't really looked at the resolutions I've added to my card in there... haha)
* Mods Page: all the images are white... it's a beta. lol
* Game Play: I soon noticed that I can't alt+tab out of the game to continue writing this review... should add that.
* Game Play: Fast. Smooth. Beautiful. All graphical features from original game work flawlessly. (shader effects, fades, cut scenes, animations, etc)
* Game Play: All particle systems work perfectly, and it looks like all NPCs also execute their scripts correctly.
* Game Play: Audio is great, noticed a console warning about an extension not being supported so it'll "use more RAM."
* Game: Uses a pretty consistent 30% of my 2gb of ram, from launch into game play (~615mb). IOW: Game should play perfectly on a 768mb system.
* Saving/Loading: Copied my saves from Windows, they load great-- screen shots (though, it seems to center them differently?) and all!

* There was one more thing... that I can't remember...
Overall, GREAT JOB! Literally, the first native Linux game I've installed that didn't do something retarded, like... not even run.
P.S. I'm sure the resolution and the mods bugs are known, so I won't bother reporting them... though, when the final version is released I'll definitely voice any final changes needed to the bugzilla linked in the included text file.