The first two thirds of this are a little wonky - the film never seems to get in a groove. I mean it's got a bright central idea - about the architect of the Death Star, and his daughter who is used by the rebellion. I liked all the various misfits who get together - the Japanese couple, the hardened rebel officer, etc.
But it never seems to get a fix on the characters - they don't seem to use Felicity Jones' rebelliousness. Also some things felt extraneous - she gets a video from dad and then goes and rescues dad?
But the final act is magnificent - it has integrity, gravitas, and I totally got wrapped up with it. War is serious.
Some random observations:
* didn't feel it was necessary for the rebellion to go "we're not going on the final mission" and then changing their mind;
* the recreation of Peter Cushing worked I felt - but Carrie Fisher felt wrong;
* David Prowse's physical presence was missed.
There's a brilliant "Honest Trailers" on this... "setting up the Stormtroopers weakness against sticks".