First things first: If you go into Rogue One expecting something just like the episodes, you will probably be disappointed. Rogue One is not like the episodes. It’s definitely a darker, more adult film (not really with regards to violence, which is about the same as the other movies, but with regards to themes).
It is, however, a fantastic movie and I loved it.
I knew going in that it was going to be about a group of rebels conspiring to steal the Death Star plans. What I didn’t expect was how far they would have to go and how far they were willing to go to do it. Rogue One has more about how the Rebellion actually functioned in its operation than what we’ve seen previously, and shows how fractured the Rebellion itself actually was.