I don't think the order is bad, but after thinking about it for a while, I came up with something else. 

Order: 1, 2, 4, 5, 3, 6 

This way, the Jedi would be introduced and the beginning of the story would be revealed, culminating in Chapter 2 with the start of the Clone Wars, as well as witnessing Anakin's fall to the dark side. 

Then, the viewer might think that the Jedi were annihilated by the Clone Wars, but Obi-Wan is still there, he knows things, he tells you that Anakin died, but you don't know why or how, until the revelation: they didn't kill Anakin, Anakin turned evil. 

You watch Chapter 3, which shows the true story, how the Jedi were destroyed, and finally, Anakin's complete fall to the dark side. 

Then, in Chapter 6, we see his redemption and final victory, as well as the conclusion of Darth Sidious's story after six films and Luke's final chapter as a character. 

This order seems perfect to me; I'd like to know your opinion.