But the point is, if I-III were made first the special effects would not be cgi, so a lot of the more elaborate shots would be done totally differently or not at all. The story in general would be different because Lucas had different experiences at the time (not bashing him, but one's experiences effect ones outlook, so the story he told as the first 3 chapters back then would be different than the one he told now).
In short the movies would be totally different, and could possibly be just as good as the OT we all know and love, could have been worse, but could also have very well been better than the story told in the OT.
-Darth Simon