A very underestimated game that you don't hear much about is EVE: Valkyrie. This year at an event I played with an oculus and that quite honestly was an experience. EVE: Valkyrie is a virtual reality multiplayer space combat game set in the EVE Universe.
Coming to Oculus Rift and PlayStation VR in 2016. Here's some pre-alpha gameplay footage captured with a VR headset.