I think the idea of a much more active Mos Eisley is sound, but the execution left a lot to be desired. Like the musical scene in RotJ I feel it somewhat confused the mood of the setting. I'd also put the Jabba scene into this category. Nice idea, poor execution. Could also have done without Fett breaking the fourth wall and looking right down the barrel. A little too cute IMO.
For me what didn't work generally falls into two categories; 1) the technology (still) wasn't up to the task (Jabba/Dewbacks) and 2) it altered the tone of the material too much (Greedo shooting first/Vader's "Nooooooooooooooooo!")
As I said, the changes I felt worked best were those that were purely effect shots. The Cloud City vistas, the Yavin V establishing shots, etc. etc. Those were improvements in the sense that they enhanced what was already there without detracting from it. It's a fine line though.
To this day I'm not sure how I feel about the finale musical number. "Yub-Nub" was hardly a masterpiece and it was nice to get that little montage to add some larger context to what had just happened...but the tone of it just felt off.
As for Anakin's force ghost...I can see the logic of it, but I think if that's the way Lucas wanted to go, then he just should have re-shot all of Sebastian Shaw's footage with Christensen. Not that I think he could have pulled it off very well, but at least it'd be consistent.