Just a few random points about Rogue One.
I thought the CGI Tarkin and Leia were bloody superb, in particular Tarkin. When I first heard they were going to put Peter Cushing in CGI in this film I was incredibly skeptical, but it really works. Yes, you can tell it is CGI, but damn if it isn't brilliant CGI. I felt it didn't distract at all.
The callbacks to ANH were really nice, the one in particular I loved was during the space battle when a pilot under the callsign Red 5 is killed (Red 5 is Luke's callsign, this essentially shows how he got it). The only one that slightly bugged me was when Jyn and Cassian bump into that bloke Obi Wan kills in the cantina in ANH. Felt that was just slightly too far, but is no massive problem.
I know it sounds bad, but I'm glad everyone dies. It shows the plans meant more than anything else, and that is really is a one-and-done story with no 'proper' sequel. Fair play to Disney and Lucasfilm on that one.
I felt Vader's use was spot on - not too much, and that final scene alone was worth it completely.
They weren't lieing when they said this is set right before ANH, were they?
Final point - sorry R2, but there's a new best droid out there. K2SO is bloody ace. Easily the bext character in the movie for me.
There's probably a couple of other things but I need to rewatch it to have a good idea about them.