I love all of the Star Wars movies. I think they are ALL good. Strange, huh? I don't believe the prequels are noticably worse than the OT.
Yes, there are elements in nearly every movie that aren't the greatest. Luke being way too whiney all the time, cheesy dialog from almost every character in every movie, the queasiness that comes to mind when I realize that Luke was lusting after his sister for an entire movie, Luke overacting, (NOO!! You're not my father!!) being unable to understand Jar Jar properly so most of his humour was lost, poor execution in explaining the story correctly, and the romantic scenes in AoTC.
Now, I may be weird or something in that I hold no ill will for Ewoks, Jar Jar, and that RoTJ is my favorite movie (Although it is in a close war with AoTC). To me Star Wars has always been about cool fight scenes with blaster bolts flying, fast paced action, and once I had seen RoTJ about the use of cool force powers. I just love the idea of people commanding others with the force, deflecting blaster bolts, throwing around parts of the wall, jumping really high. I love magic and cool powers. To me, that's what Star Wars is about anyways. That and cheesy dialogue.
So in that vain. Someone asked for it...lines that stick out in my head as truely classic. I know, because I'm that guy who can't stop quoting Star Wars movies during inapporpriate moments and ones from the prequels that have entered my vocabulary are:
TPM:
"You're right master, the negotiations WERE short"
"Wipe them out. ALL of them"
"The ability to speak does not make one intelligent"
"Greed can be a powerful ally"
"Fear leads to anger, anger leads to hate, hate leads to suffering"
"Yousa not-a thinking yousa better than the Gungans.....Meesa like dis"
AoTC:
"You want to go home and rethink your life"
"If a system is not listed in the Jedi archives, then it doesn't exist"
"You call this a diplomatic solution?" "No, I call it agressive negotiations"
There's more from AoTC, but I haven't seen it in a while and my brain hurts right now.
Still, I suggest enjoying the movies for what they are. I prefer the attitude of "Star Wars comes from Lucas, whatever Lucas gives us IS Star Wars. I can either like Star Wars or I can rant about how it isn't MY Star Wars." I prefer the former. I love every moment of it and wouldn't trade it for anything else. As a side note, something for everything to think about: I organized about 14 friends to see TPM when it first came out, got into the 3 am show. When we came out, basically we had 13 out of 14 people saying how great the movie was ano how unbelievable it was. Then all of them talked to their other friends and got online and started discussing it. The general opinion amongst everyone else was that the movie was a horrible perversion of Star Wars and Lucas didn't deserve to live for creating it. 2 weeks later, I was being shunned by all of my friends who had changed their mind and decided they agreed with everyone else and that I was an idiot for liking a crappy movie.