4. Team Fortress 2
Don't expect to, y'know, win if you play Team Fortress 2 with the Oculus Rift on--it's hard to do much of anything twitch-based when you're still getting used to virtual reality. Valve added support to the popular multiplayer shooter months ago, adding to the small cluster of games with official support. But despite being remarkably difficult, it's still quite a bit of fun to run around the maps with the device strapped to your face, giving you a new appreciation for the levels... even as you're being blown to smithereens every time you try to do anything.
TF2's difficulty shows that hectic first-person shooters might not be the way to go with the Oculus Rift--at least, not yet. It might be better to focus on immersive, offline games, or at least ones that don't require absurdly quick reflexes. That said, if everyone in the match had one strapped to their heads, it might be a different story, since a lot of the difficulty comes from other people not having to deal with the difficulty of a new technology.