The prequels need a lot of work, especially the first two. Although I thought Episode III was somewhat likeable.

I would have perfered however that in Episode III, you should have Anakin not kill the younglings. Make it so that is turn is not yet complete and he still has doubts. That way he still has some obvious good in him. Anakin spares the younglings, but they are tragically killed by the clones. Later on at Mustafar, Padme is able to calm him down and able talk him into leaving the dark side, but when Obi-Wan shows up, having snuck on the ship, Anakin gets furious, and the same thing happens as in the movie. This way when Vader is told that he killed his wife, it is essentially the end of any and all good in Anakin, until his son Luke can bring him back.