The best of all the Disney star wars movies. (That's some low hanging fruit though).
Fleshing out the strike team and making it a more of a rebel plan than a rebel against even the rebels kind of plot would have been more believeable. It's also a bit stilted at the start to as they try and rush into the story.
These are minor gripes though. This movie excels because its kinda gritty for star wars. It shows the rebel characters not as the clean cut hero's of the galaxy but rather a desperate group of fighters who have done terrible things in the name of fighting tyranny.
The characters a likeable, the droid comedy relief is not over done and his dead pan delivery is gold. The rebel operative Cassian Andor is perfectly cast and really sells the gritty nature of the rebellion. He's not a clean cut hero, he's on the right side of the fight but has done terrible things that clearly haunt him.
Jyn Erso is great, a strong and independent female lead. Her rise to leadership is a little abrupt but overall she's a great character. Unlike Rey who is a poorly developed and weakly written Mary Sue, who is already so perfect from the get go that she's almost completely unlikable. Rei is just automatically amazing at everything for no reason.
Jyn on the other hand is jaded and brutal, having grown up in the midst of rebel fighters and fanatics. It makes her immediately likeable and believeable that she would have the skills she has, given her history. This is how you do strong female characters and she really sells rogue one.
Also the scenes with Darth Vader really reinstate him as a terrifying antagonist. Ressurecting him from the brutal depiction of him as a little fat kid then an angsty tweeny douche. In this he is fomidable, brutal and terrifying. Its the Empire Strikes Back Vader returning to the screen.
It holds it own alongside the original trilogy.