Overall Feeling:
Sea of Thieves is as much fun as the friends you're playing with. With a solid group of like-minded people you can share some of the most story-worthy experiences of the year, however the actual content of the game feels lacking and if you're in a group or two or flying solo you may experience some serious lack of content.
Generally speaking, the idea of a "playground game," which would be how I define a multiplayer sandbox that focuses on the players themselves making the most interesting gameplay, is a genre I haven't had much interest in. Sea of Thieves is fairly light on content, which means it is definitely a game that lives or dies based on the friends that you're playing with.