I expected Episode One would be about the Clone Wars, already in full swing or perhaps their beginning. Jedi Knight Obi-Wan meeting young man named Anakin and to begin training him in the ways of the force, and Anakin proving himself to be a great hero by braving some impossible desperate battle, much like his son did in Ep. 4.
I expected Episode Two to have been about a little more desperate than the first one, kind of mirroring ESB. Anakin would be with his wife by now, during the big and desperate crisis we would have a dramatic Darth vs. Luke Bespin like fight, but this time instead of like Luke choosing death rather than the dark side, Anakin would be intrigued and want to learn more and would be corrupted. I thought the film would climax with Obi-Wan discovering his friend had turned to the dark side. Much like ESB ended with the heros preparing a search for Han, this would end with Obi-Wan's preparation to bring his friend back to the light, even though he has been told it is impossible, he is sure his friend still has good in him.
I always thought Episode Three would focus on Obi's trying to bring his friend back, and ultimately ending in disappointment and realization that his old friend was lost and nothing could be done to bring him back. I thought Obi-Wan would realize his friend was dead, perhaps after seeing how he is capable of slaughtering his old Jedi friends as he hunted them down one by one. I figured this would end with the famous battle with Obi-Wan that ended in Anakin falling into the lava/acid, but ultimately escaping.