Here's my opinion on the matter:

Episode I: Definitely the worst of the lot, mostly because it was simply boring. I personally don't dislike the concept of midi-chlorians, but they weren't thought out at all, so the movie fucks up on that, too. And Jar Jar. Can't forget him. I've got to admit, I like the Naboo Starfighters, though.
Episode II: Would have been pretty good if not for the unfortunate romantic plot tumor and Hayden Christensen's acting, plus the use of "Count Dooku" instead of the much more badass "Darth Tyrannus." That all said, though, these things don't entirely ruin the film.
Episode III: Actually surprisingly good. Hayden Christensen is only slightly better and the usual amount of cheesiness remains, but the movie was pretty good overall. I especially liked the Emperor.

At least give Episode I the light saber scene, I mean, that scene was awesome!