Isn't that the novelty of the "prequel" form itself? That you know what comes afterwards? You can't really single out Star Wars as being particularly flawed because of this. I actually think it makes for a unique viewing experience--you know what he becomes so one feels rather helpless watching him make several major bad decisions. And the whole point of the SW prequels isn't WHAT happens but WHY it happens. Why does Anakin become seduced by the dark side? Why does a democracy give itself over to a dictatorship?
I'm sure there are better ways it could have been done, but had Lucas written digestible love scene dialogue, gotten rid of some of the digital clutter (like random droids/aliens in the background everywhere making stupid noises), and found someone else to do Jar Jar's voice I don't think there would be a lot of complaining about everything else.
That just boils down to personal taste then. I can dig reboots, because they're trying to jump-start a completely different series, but prequels rarely work for me.
Episode III works on the level that you're describing, but in the end, we have 2 movies worth of set-up with some great action setpieces for 1 film with nearly everything? It seemed like the story this series tried to tell had two points, the birth of Vader and the end of the Republic, and it succeeds to some degrees. Tonally, the first two films were way off, with an insane amount of childish humor peppered into some serious situations. None of which seemed organic to any situation or funny, for that matter. God, pretty much everything Han does on the Death Star in
Star Wars is hilarious, but it's played completely straight... either that's a testament to Ford or Lucas, or whoever, but neither of those films had that sort of edge. Maybe some of Anakin and Obi-Wan's dialogue back and forth did, but not really. It never reached that dark territory until Shmi's death in
Clones, then it went full force into
Sith.
I can appreciate Lucas trying to expand the digital medium into something fresh and exciting, but I think it cost him that suspension of disbelief that is so prevalent in the original series. Take the sail barge sequence in
Jedi (which is as muddled of a mess as
Menace and
Clones), it's a solid action setpiece, nothing too spectacular, but compare it to the green-screen fest of the droid factory in
Clones and it's not even close... the amount of "fake" things in the sequence overwhelm everything around it.
The use of digital effects in the cityscapes and surroundings were mesmerizing, but there's only so much an actor can do when he or she is talking to a tennis ball on a string, or running on a treadmill in the middle of some soundstage.