Update:
I can use 1.1 pixel shaders
if I enable 1.4 or 2.0 I crash at character select
I can enable Use Advanced Lighting but it creates some wierd flashing colors in the background on character select also.
Shadows work, but I always found them to be a resource hog.
As for playablity , minus the above issues and the full screen mouse issue, it works just as good as it did on windows.
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