While I thought Act 3 was exciting, fun, and nostalgic, the rest of the movie was really boring to me. It's formulaic CGI action. The main reason it doesn't work is because Hollywood seems to have forgotten how to create characters. They plop a girl down, shoot her mother and say say "Look. Orphan. Care about her now. She's the main character." and that's it. I don't care about her. She hasn't been developed. She has no personality. I don't know what makes her tick, I don't see her develop. In short, there are no stakes, so all the shooting and lasers are meaningless to me. The only character that was likable at all was the Droid, because he had a distinctive personality.
Completely agree that the rapid location changes were disorienting and added nothing. The whole thing was generally too long. That being said, from the point when they start trying to steal the plans, it was pretty fun.