Kayak VR. It was really cool and pretty for about half an hour, then I got bored and sick. I have a pretty strong VR stomach, but something about the way the motion works in the game just didn't work for me.
I also didn't really care for Arizona Sunshine. Maybe it's the story or the way the zombies were done, but I wasn't too thrilled with it.
I used to be able to say VRChat, but then I met a lot of cool people people in there during some private raves, and it completely flipped my opinion on the platform. Popular public rooms are still pretty much asking for trouble.