I haven't messed with the retail Rift or the Vive but on my Rift dev unit, I enjoyed watching 3D movies in one of the "fake theater" environments. It simulated

I haven't messed with the retail Rift or the Vive but on my Rift dev unit, I enjoyed watching 3D movies in one of the "fake theater" environments. It simulated a giant movie screen and could interlace a side-by-side 3D movie file to generate an effect similar to what you'd see at the movies. I found it actually better in some ways, mainly because you could adjust the amount of "depth" separation if the default seemed off. At the real theater, it ought to be correct as shot but if you want to tweak it, you're obviously out of luck. That said, I still don't watch many movies in 3D. I think the best one I watched with a VR headset was "Gravity" (in terms of the overall impressiveness of the 3D effect and the immersion).