TV's Frink said:

Whenever we have these "which order to watch" discussions I have to throw out the 4-5-1-2-3-6 idea.

*throw*

You know, I actually thought the exact same thing awhile ago. I thought, if I ever have children and show them the Star Wars movies, I'd really want the surprise in Empire too be maintained, BUT, Jedi has a lot more impact, I think, knowing the Anakin backstory (heck, it almost even makes the HC ghost at the end not seem so bad since we just saw that version 1 movie ago).

I like to think of it as telling the story from Luke's point of view. 30 minutes into Jedi, Luke is told the truth about his father and placing the prequels so close to this point allows you to discover this as Luke does, and in similar period of time as Luke had 6 months (6 hours) to think about this during the Shadow's of the Empire time period.

Just something to think about also but consider the sister reveal as well. The Jedi reveal kinda sucks and the Revenge reveal actually works pretty well minus the whole "lost the will to live" crap.