I think Episode III is great. I watched it again last friday.
It does still contain a few corny dialogues like the other prequels, but way less. The action sequences are all quite exciting. Ewan McGregor does a good job at Obi-Wan who sees his friend fall to the Dark Side while Hayden Christensen in turn is way more into the role than he is in Episode II. He does the angry emotions pretty well. Ian McDiarmid is and always was great being the Emperor and the film gives him lots of great screentime wrapping up the plotlines of his clever plan to take over the galaxy and I think his use of politics and the way the prequels increasingly focussed on that and the manipulation of the Jedi was a cool plotline.
Overall, the third prequel is just much more mature than the first two and if all three were of it's quality nobody would complain much about the prequels. I agree The Phantom Menace is quite mediocre and only the final fight with Darth Maul is by far the best thing about it. Attack of the Clones is okay enough, if maybe a little slowish. Count Dooku I feel was underused, especially given they had such a legend as Christopher Lee to play him.
Sure, even Episode III isn't an Episode IV, V or VI. Those are classic in every aspect. And that's why I'm so excited for Episode VII. It seems to have the real Star Wars feeling, it looks like the originals, and of course having some of the old characters in them helped a lot. I knew they would be in the new movie, but I lost my shit seeing Harrisson Ford and Chewbacca in the trailer.
The new trilogy isn't going to be worse than the prequels, if they are, I'd probably ignore them for the rest of eternity... Or something, I don't really know what I'd do, but I think I would be pretty depressed in any case.
On a different note; How is everybody so certain the EU is no longer canon in any way? I'm no longer that much into the Star Wars lore and current affairs as much as I once was so maybe I missed something, but as far as I know all that was really stated is that they aren't going to hold back or purposely write around something if new material under made under Disney conflicts with earlier EU material. In other words, everything still happened, until Disney writers say otherwise, not that the EU outright doesn't exist off the bat.
This would create conflicts in itself anyway. For example; The Battle of Ruusan, where the Jedi destroyed the Sith and after which the Republic as we know it in the prequels was formed was written about in the EU, but in Episode III, a mural depicting this battle exists in the chancellor's chamber. Moreover, Ki-Adi Mundi on the Jedi Counsil refers to it in Episode I when he says that "the Sith have been extinct for a millenia". So, written in the EU, but implied in the movies, canon or not? Who would decide what counts and what not? So as far as I'm aware, KotOR that and whatever else happens before the movies is still canon and will likely stay that way until Disney decides to make new content takes place in a certain time-period. Even the Jedi Knight series and the New Empire are still as well, though that last one will now highly likely be overwritten making it non-canon. If anyone has a clear quote coming from someone that's in charge of Star Wars nowadays, then please, enlighten me.
Lastly; about memorable quotes from the prequels, surely this is one: "No money, no parts, no deal!" 
Or of course, "NOOOOOOOOOOO!!" XD







