I guess I'll weigh in on the derailment:
I'm for people viewing SW as they want: ANH as stand alone, the OT as a complete work, or the PT + OT as a complete work (+EU if you like).
Though Anakin's conversion is a bit abrupt, it does make sense if you look at the context (which is what Lucas should have focused on). Here's this "hero" who needs to make life-affecting decisions everyday on the battle lines. You can imagine a hypothetical general having to deal with the moral issue of whether to save the schoolhouse and risk sacrificing the whole town. Lucas' ROTS Anakin is too streamlined to give him an adequate context. We see him upset about Padme, next swearing allegiance to Palpatine, next killing younglings. What Lucas needed to do was set this up better in Episode II. If a "hero" constantly must quantify life and view saving planets as "objectives," then the kind of moral relativism that Anakin falls into makes perfect sense when it results in him believing in an all-powerful dictator. If all your "heroics" still don't save people who can't save themselves, one would feel compelled to act selfishly in only caring about his/her spouse. Anakin's war-time experiences push him into a place where the only things that make sense are fighting for the things (Padme, their child) he cares about and an absolute power to end suffering. I think the ROTS novelization gets at this a lot better. It's a shame that Lucas makes Anakin's conversion so abrupt. But, symbolically, he does retain the overall point that good people can become evil for all the seemingly right reasons.
*returns to lurking*