Did you ever wonder what order to watch the Star Wars movies in? So did this guy: http://static.nomachetejuggling.com/machete_order.html.
I know people who watched them in order I through VI, and found it to be a real anti-climax. Of course, the “grand twist” in part V is already spoiled if you have seen I – III before. But why should you see IV – VI and then I – III (the order in which they were filmed)? That my also really be a downer, for the “real” ending still is in the end of part VI. But let me not repeat, nor spoil what you are going to find when you follow that first link.