Just got back from the theater. I thought Rogue One was great - two chainsaws up! In my opinon, it fit way better with Episodes IV/V in feel and look than anything yet, blending almost seamlessly. I really have no serious story, script, acting, set or score complaints at all. I thought Edwards did a very good job featuring all the cool stuff and I hope he gets to do more. A bounty hunter movie telling the stories of the folks standing before Vader in Empire and then culminating with that scene would be would be money.
I enjoyed it. I give it a B+. It was suitably dark, and it had plenty of cool moments, but it just didn't move me emotionally as much as the "saga" films.
To each his own, I guess! I found it way more interesting and engaging than anything since Episodes IV/V.