Let me contribute!
I'm also 19, loved TPM when it came out and came to realise over the years that it wasn't that great. But I've matured FURTHER, and accepted that the original movies weren't perfect either. Let's face it, movies inherently suck. You've just got to accept that basic fact and decide not to focus on the fact that The Red Sea parting looks hokey, or the fact that in front of Gandalf's 'heroic charge' is some blatant Adobe CLONE STAMPING, or the fact that Anakin's knife doesn't accurately chop up his CG Pear, or the fact that Bruce Willis' gun never runs out of ammo until the worst possible moment...
Jeeze! You don't have to defend the movies, and you don't have to defend your liking them, or even your right to like them. They're just a bunch of images and sound played concurrently, and believe it or not whether or not they suck or are great is ACTUALLY dependent on the person. A perfect movie (and I've been shown quite a few of those, and nearly always think they suck) would have everyone agreeing that it's perfect. Personal opinion would not come down to it - this movie (the hypothetical perfect one) would cross all barriers of taste and criticism and simply be the best. It doesn't exist and it never will, which basically means if you show a good movie and a bad movie to a rock, they'll recieve the same reception - Total Silence.
This means that there is no good movie, and no bad movie. It's all in your head.
I can't deny I like some movies more than others (among my favoured movies are "You Can't Stop the Murders", "Napoleon Dynamite", "The Princess Bride" "Lord of the Rings" and "Star Wars"), but at least I can accept that these preferences are my qualities/failings alone. They are not the fault of the filmmaker.