>>273514330
>I've heard oculus described as a walled garden many times.

That's because there are games which will only run on it, not because there are games it can't run. 
It is fully SteamVR/OpenVR/whatever compatible.

As far as I am aware it does need the Oculus home software running but SteamVR/OtherSDKs just layers over the top of it, there's no performance issues that i've seen reported anywhere.
I have a vague memory of there being some software around that can let it work without Oculus software running, or at least minimizes the oculus software footprint heavily but I can't remember what it was called, sorry. 

Oh and if you're wondering, you do not need to connect it to a facebook account.