I don't hate the prequels as much as a lot of people seem to. I first saw them as a teenager, around 14-15, and I didn't understand why people hated them so much, I actually liked the corny dialogue in ep. 2, the 'romantic' dialogue was exactly the kind of thing I would say in that situation, I could relate to the romance in eps 2 and 3 far more than any romance movie. I never understood what people had against Jake Llloyd and Hayden Christensen's portrayals of Anakin, they both played the character as written and directed.
I have noticed however, that I like them less and less as I age. I never liked JarJar and I have always been put off by the gungan dialogue, I would have preferred them to talk normally. I never used to mind the overuse of CGI, but it did get to me a bit the last time I watched them, especially the battle on Geonosis.
There are two main things that I particularly like about the prequels, and are arguably better than the originals. The first is the lightsaber duels. I know people don't like how over-choreographed they were but I would rather that than the gentle prodding we got in A New Hope. My favourite lightsaber duel is the one in ROTJ, but the Mustafar duel is a close second, I appreciate the massive effort that the actors put into learning that choreography.
The second thing is the story. Unfortunately the bad dialogue obscured this for a lot of people, but if you can look past that and look at the underlying story, then everything makes a lot more sense, it's pretty much a Shakespearean tragedy. I find it really ironic that all of a sudden fans have begun to appreciate the prequel story for its originality, now that TFA has turned out to be a rip-off of the originals. If anyone complains to me about how unoriginal TFA is, the my immediate reply is 'blame the OT fanboys who didn't give the film-makers any other choice'.
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Apologies for the excessive length of my posts.