Linux binaries = crashes, some stuff wont load propperly, more glitches than normally
Not in my experience, in fact Linux binaries seem to crash less then Windows (when it comes to spammers and such anyway.)
Granted, there will be some compatibility issues with mods - particularly .dll's, since linux cannot support them. If the creator of the .dll's will not add in linux support (.so's) then that is their problem, not the server or Garry's.