It is a gimmick...
You can see applications like porn for it, just like fitness applications for the kinect. The VR is not necessary to enjoy any applications. It just presents them in a slightly different way. It's unecessary to enjoy the applications, and thus a gimmick.
I've said it since day one. Bring me the holo deck or during sleep VR and we can talk. This is still just 2 screens on your face to simulate a 3D depth effect and tracking of head movement.