While there have been a ton of progress running games (a lot more are native ie Tombraider 2 new ones, & games like dying light & the Metro series etc) then some in steam are using Wine: but can be tricky on Wine.
VR has still been slow, HTC has been added for support & Oculus can be ran on linux via a linux driver & using oculus sdk through Wine to fill in the blanks so to speak. Steam doesn't have a lot of native VR games as of yet.
So unfortunately for the time being we need to stick to Windows to have the full monty of variety. But it is coming.
I myself of late use Manjaro which is Arch based; but tailored to be easy to use like Ubuntu.
Feral Interactive did the ports on Tombraider & Rise of the Tombraider.
And of course Pimax will want to have the 200 FoV headsets working well in one OS before working on OSX & Linux. But the Linux Community is often known for trying to find there own way of fast tracking wants.