While I did enjoy the movie, it felt like they took the next season, stripped most of the characters out and turned it into a movie. I think the season 3 plot line of Mandalore would probably have made a better story for the big screen.
From the start, one of the things that threw me off was Rotta being kidnapped. This was already a plot line in the Clone Wars cartoon show. I thought “man this kid gets kidnapped a lot”. I was at least pleasantly surprised to see he was an adult and not a baby this time. I ended up enjoying the second half of the movie more than the first half.