It's more concerned with wrapping up all of the loose threads (some in a big way a la Jabba, and others in a line of dialogue or two) than it is with the Empire for most of the first half of the running time.

I'm thinking of PotC3 and if it was any better. It had its own little plot that seemed to come mostly out of nowhere and I felt that was a weakness for that movie.

Return of the King- anything ground breakingly new (*cough* ghost army *cough*) really shouldn't be introduced in the third act... All of the pieces should be on the table... That scene really frustrated me because it seemed all was lost and how would the world of man go on?!?!? Oh yeah, remember those ghost guys that owe us a favor? (5 minutes later) Thanks Dudes!

So... should Jedi have had more of its own identity? Or is the role of the 3rd Act (macro or otherwise) only to wrap up the problem as introduced in the 1st Act, and the complications which were introduced in the 2nd Act?