The biggest problem IME is that VR headsets are not very high resolution, since the screen needs to cover a wide FOV but your eyes look for sharp detail in the center of what you're looking at. So you'll see a slight screen-door effect or aliasing. The VR cinema feels nice and big but you won't see the same level of detail as in real life.

Motion sickness is not usually an issue with apps made for VR because they've usually implemented move-by-teleporting. I've tested VR with multiple people who get motion sick playing regular first-person games like Minecraft, but they don't get motion sick in VR.