An amazingly produced show, with craft unlike any other and a premise probably unlike any you've ever seen before. The acting is amazing and the pilot had a very strong sense of purpose and tone.
My only problem is that all of the groundedness was thrown out the window by the sixth episode (the beginning of the final quarter of the season). Hints of the troubles to come were gleaming from the episodes that came prior but the issues really shone in episode 6. The conflicts are way too many and almost none of them are well set up, too much stuff happens in one episode considering the cast is not that huge and the finale was a huge letdown as I wasn't hooked throughout the whole thing.
The worldbuilding in the show is great but storywise it is executed mediocrely. The family is constantly relocating because of some sort of capture of thievery and that's about the only way the show expands its universe.
I will say though, that the conflicts finally settled into a reasonable form by the end of the season and it looks as though season 2 will be miles better.
Is it worth watching? YES
Is it Apple's Game of Thrones? No. NOT YET.