I like playing TF2 on the Rift - the "I AM SHOOTING WITH MY FACE" aspect is fun - but it's just too vomit-inducing for me, and most people we've tested it on.

Great fun if you don't get motion sick at all, otherwise... not ideal.

As the comment below indicates, it's also very similar on and off the Rift - no real "wow, VR" moment.

I don't find TF2 to be that much different with the Rift. I think it's just too fast paced, so I just end up playing it as normal.