Yes, he sounds like a whiny schoolchild, but he makes a fair point, and although I don’t blame him, I must admit I’m disappointed. The Star Wars films are excellent, and you can expect to read my List post upon them soon (we had a lovely little Star Wars marathon weekend last month), and I even enjoyed the prequels. If it wasn’t for them, I’d have gotten into Star Wars much later (remarkably, I saw the films in episode order rather than release date), and found the most recent Indiana Jones film enjoyable and a very entertaining film, just not as good as the rest in the series. FYI, it was still voted onto the list, so I’m not alone in this reasoning.
If you don’t like a film, by all means don’t recommend it to your friends, and even write a negative review about it if you like, but no-one is forcing you to see it, and what right do you have to contact the guy who made it and piss on his cornflakes? If you don’t like his films, don’t see them. If you don’t approve of his modifying the films he’s already made or converting them to 3D, don’t buy them. If they’re really that bad, enough people will do the same, they’ll make no money and he won’t make any more, but don’t ruin the enjoyment of anyone who does like his films by encouraging him to not make anymore. Lucas continuing to make films does nothing to you whatsoever.