I will always contend it doesn't matter which order a person first sees in the movies as quality will rule out in the end. So whatever the person sees as good or bad movies will not be affected by seeing them 1-6, or 4-6/1-3.

I grew up in the age before VHS early 80's and saw many sequels before the original simply because they came on HBO at that time. I saw Jaws 2 before Jaws, I saw Rocky II before Rocky, and saw Temple of Doom before Raiders. I had differening opinions of all those movies series growing up because I saw them out of order, but through the years the quality of each movie ruled out in what was my favorite. Rocky, Raiders, and Jaws are my favorite of the series, just as SW & Empire are my favorite of the series even though I loved Jedi more as a kid.

As much as I am not a fan of the PT, I have no problem with kids seeing them even first, because when they older the quality of each one will rule out.