I think we'll soon have to get away from the mentality of "any first-person game = great VR experience". The games that will be perfect are the games made for the device.
I can't remember where I read it but someone from Sony I believe offered an example of PS4 games that were played normally with a special Project Morpheus mode that let you walk around the environments of the world as though you were there, but not engage in combat or whatever else. So imagine exploring the various levels of, say, The Last of Us, in VR, after you finish the game. Could be pretty cool I think. Obviously that's not the only experience I would want but it would be a nice bonus feature.