Rogue One is worth watching if you haven't already. Miles ahead of anything else SW related Disney has put out.
Rouge one had the most one dimensional and forgettable villain ever. We like it because it was a very pretty and unusually unique and dark war movie. It's not like the story or world building was up to the standards of the original trilogy...
That said, as an adult, after being let down immensely by eps 1-3, and finding mediocre/nostalgic entertainment in 7-9, rogue one actually feels better to me than all other movies.
I can't really compare it with Mandalorian though, except that they compliment each other nicely. I like RO because of it's dark, everybody dies in the end, that is totally NOT something you'd expect from ANY disney movie.