I had a chance to play a bit on Vive last October, bit of Serious Sam and then some other stuff and it certainly has lot of potential, but the resolution is in dire need of increase before that happens. I did not realize, until i tried, what people mean by that you can see pixels - now i do and honestly, its terrible, everything looks sadly like shit, jagged, blurry... when you compare it to crystal clear image of some 32 inch 4K display you or even better 38 inch ultrawide, those are far better choice right now IMO...
Then again, once the tech matures, resolutions and visuals improve, its gonna be awesome, cause its really, really immersive. I was literally moving my whole body to avoid some fireballs the enemies were shooting at me - or i fell from some kind of walkway out of skyscraper window and i totally felt that weird feeling in the back of my head like when you move in a fast lift or inside the plane which is taking off - so it totally managed to fool my senses!
Lets just hope it does not die before it gets good enough.