I don't who this Joss Whedon guy is, but damn he is 100% right on how to make a saga great, and how to ruin it.
Then I HIGHLY, HIGHLY suggest that you get the Firefly DVD set and if you can, get your butt to the theater to see the movie, Serenity.
It is everything that Star Wars is lacking in the prequels. Firefly has a Han Solo that shoots FIRST!!!!!! That's enough for me.
Seriously though, I've been listening and reading a lot about Joss Whedon and I can't help but think that this guy knows what he's doing and knows what the hell he's talking about. Plus, he's a pretty likeable person and seems like he's doing this for fun. Watching Lucas in the bonus stuff on the DVDs was like watching a test pattern.....BORING!!!
Another interesting comment by Whedon in the commentaries was about AOTC. Joss something to the effect that there was stuff he really didn't agree with early in that film. He never elaborated and I think it might have been about camera work though, but I would LOVE to hear his opinion of the prequels, mostly cuz he's a writer in Hollywood who's doing work that I think is better than most out there right now.