I gave it a 5.
Pros
Dramatic ending with real weight, some reasonably good lines, reasonably good acting from Ian until the Mace Windu scene (which, in my opinion, was pretty awful). Awesome intro space battle. Haydn actually manages to act in about 60% of his scenes. Natalie Portman gave a decent performance and Ewen McGregor was alright. Order 66 was pretty nicely depicted.
Cons
Yoda was awful. Some real clunkers in the dialoge ("Its because I'm in love with you"/"No its because I'm in love with you"😉. General Greivous was a waste of a villain, a big letdown. Tooooo many lightsabers, it made the Obi/Anakin duel much less impressive. Score was weak. And the droids got annoying eventually.
I give a preliminary 8. I want to see it again now that the shock of the unknown is gone. Ian rocked! Hayden was great when he starts yelling at Padme at the end. Ewan was a stable even toned performance ( I would have like to see him have an emotional moment after he was out of sight of Anakin though...) William's score was on target, especially during order 66 and Grievous was badass during the four-armed saber scene! IMHO
I gave it a 7. I liked the movie, but George put too much into 2 1/2 hours. Things moved too fast. The Genreal Grevious fight was too short and he should have done more. I would have loved to see more of Vader in his original suit. I think Anakin should have freaked out when he first put the suit on. He seemed a little too normal about it. Plus Vader should have had more lines. What I wanted to see was too short.