It starts out with you crashing on an alien water planet and basically just tells you to go.
I was really excited to splash into the water and start swimming around to discover new life and strange oddities.
What I actually found is an underwater game with a limited oxygen meter that is channeling the crafting mechanics of Minecraft. I've done enough Minecraft style crafting for one lifetime... I don't really need to do it in any other game again.
Granted, Subnautica is still in early access and things could change. As it stands it isn't a game I want to play. But if they make a mode with no oxygen meter and free exploration of an underwater realm then I'll jump back in and have fun exploring.