I'm really enjoying Subnautica.
I bought it a few months back on PC, but found that it was in a bit of a choppy state at the time, and load times were very long, so I got it refunded and planned to get it again when it developed a little bit further.
It has developed a lot since then, and now it's on Xbox Game Preview, so I purchased it on there, as I think I'll play the game more when it's released and on Xbox.
But unfortunately the current state of the Xbox version is pretty much exactly where it was when I got it on PC!
They're trying to get it up to date at the moment though. They wanted to get it onto Xbox sooner rather than later, so they put through an older version, and they're just waiting for Xbox to push the update through.