I agree with Kevin Drum pretty much. There were two things that reallybugged me about the movie:

• Fast cuts between the Yoda/Palpatine and Obi Wan/Anakin battles were superfluous and annoying, when one wants to get the full effect of both battles. Similarly, fast cuts between Padme dying and Vader almost dying were superfluous and annoying, for much the same reason. That's just bad movie-making.
  
• James Earl Jones was wasted. Vader is emotionally stripped, done in. When the Emperor asks if Vader can hear him and Vader says, "Yes, master." Great! Fantastic. Then he goes off in some kind of emotional catharsis? Wha...? Especially because the lie was so unneccessary; Vader was already turned and wouldn't go back, and blaming others for putting him in the position of hurting, thus being unable to save, Padme was sufficient. The better way to do that scene would have been, after the "Yes, Master," to have Vader say, "Padme?" The Emperor would answer: "She is dead." Vader would then stare at Palpatine for about 8 seconds, with no music and no dialogue - just breathing. Then Vader would turn on his heel and stalk off without a word. That would have been Vader.
  

Short take: worth seeing; didn't suck; best of the first three; on a par with Return of the Jedi, but not as good as A New Hope or The Empire Strikes Back.