To coincide with the re-release of Star Wars Episode I: The Phantom Menace, George Lucas did this interview. In it, he makes it clear that his original intention was that Greedo shot first in Star Wars Episode IV: A New Hope. This "change" has been one of the most controversal to the Special Edition of the original trilogy.
Lucas: …The controversy over who shot first, Greedo or Han Solo, in Episode IV, what I did was try to clean up the confusion, but obviously it upset people because they wanted Solo [who seemed to be the one who shot first in the original] to be a cold-blooded killer, but he actually isn’t. It had been done in all close-ups and it was confusing about who did what to whom. I put a little wider shot in there that made it clear that Greedo is the one who shot first, but everyone wanted to think that Han shot first, because they wanted to think that he actually just gunned him down.
I took my oldest daughter to see The Phantom Menace in the theater, and she enjoyed it. And she should. The moview as made for five year olds. With the passage of time, I view he prequel trilogy as "okay" as far as movies go. I look back on how influential the original trilogy was to me, in terms of sci-fi, design aesthetic, and philosophy, and it still is. In many cases, the changes made to the Special Editions of the original trilogy do not change that, they just add complexity to a perfectly elegant story.
I just do not forsee anybody getting kind of "life" messages and inspirations from the prequel trilogy, which ends up just being a seven hour description of why Darth Vader is bad. Maybe the message to be received from the prequel trilogy is that we, as a society, love to spend time and effort looking for reasons that people are evil. Darth Vader is evil because he committs atrocities. He hurts people. Fighting against Darth Vader, and all of the Darth Vaders of the world, is what is important. Why Anakin Skywalker turned into Darth Vader is something that people can endlessly debate once there are no more Darth Vaders to worry about. And there will probably never be no more Darth Vaders to worry about. So, concentrate on the here and now, not the past.
And, despite what Lucas says, I remain convinced that Han shot first. If that was a "mistake" on Lucas's part, then I guess that is part of what makes the original trilogy so special and magical. A "perfect vision" movie is more what comes to mind when watching the prequel trilogy, and those just lack soul, the soul that comes from imperfection.
So if you do not already have it, spend the money can get the version of A New Hope that comes with the original theatrical release, and make the decision of who shot first for yourself: Star Wars: Episode IV - A New Hope (Two-Disc Widescreen Enhanced and Original Theatrical Versions)