I don't know precisely where I'd place Metroid Prime on my 'all time favourite games' list, but it's easily top 5 and possibly even top 3. Cymatic Bruce has managed to get the game working on his Oculus Rift dev kit and needless to say I am stupidly jealous.
For the purposes of brevity I'd suggest skipping to about 10 minutes in the video to see the game in action, but there is actually a fairly comprehensive guide explaining how anyone with a kit can get the game working on the Rift.
Even Cymatic Bruce himself admits it was a lot of "legwork" to get the game running, but I personally believe that Metroid Prime is one of the most 'immersive' experiences in video games (for want of a better term) and playing it in the Rift would be worth the hassle. Metroid Prime is essentially played from the perspective of being inside Samus' suit, so it makes the idea of using the Oculus Rift to play all the more seamless.
I want to play this so badly.