I didn't have any expectations for this. I thought it was well handled, even some of the controversial characters (I think one character specifically is going to split the SW community in two). The action sequences were great! Ground combat, space combat, melee, all done beautifully. I actually felt tired at the end of the movie because of the amount of things that were going on.
Unfortunately the movie is too short for us to get to know the back stories of some of the more interesting characters. I'd recommend this too any SW fan. It's great to see a movie dedicated to the people that made helped the rebels take on the empire.
I think I might even like this more than SW VII. Either way, you're bound to enjoy it. It's a great chapter in the SW universe.