I suppose the thing is with Star Wars was that it was an adequate, if somewhat dated, story told in a new setting.
The original three were somewhat hampered by good story ideas but limited ability to put the idea on screen because of budget, the second three suffered from the opposite, plenty of funding to make it look gorgeous, but it had no idea where it was going when it started, and still very little where it ended. It knew it needed to finish with a young Luke and Leia, but just seemed to meander in that general direction with no real impetus at all.
Also, it's got to the point where I really do think that Lucas is just trolling, as has been suggested before, the things like replacing Darth Vaders image in ROTJ, the 'Han shot first' incident and the whole 'Nooooooo!' thing in return of the Jedi makes me quite convinced that Lucas really didn't care about the movies any more, but just saw a way to make a bit more money before selling it on. That's why I think the sale of the franchise was a good thing in theory.
I suppose the thing is, Star Wars 4-6 were swashbuckling movies with a bit of 'Martial Art Movie' mentality thrown in, there's no questions of whether the good guys are really good or not (even Han just fills the 'Rogue' slot nicely), it's a nice polarized story that progresses moderately smoothly from point A to point B. However 1-3 gets so wrapped up in existential angst that it failed to sell itself to me, the story meandered around, never quite sure of what it was doing or where it was going, and many kinds of 'progression' within the storyline felt forced or too coincidental to work. All the leaping around in the world couldn't quite detract from the feeling the films weren't quite sure where they were going.