I don't get the hate for II. Skip all the scenes on Naboo and it's a pretty good movie. Episode I is also not that bad. The Gungans are stupid, but the rest of the movie was well acted. Jake Loyd wasn't the best, but he didn't kill the movie.
III is the useless one. Palpatine becomes a cartoon character instead of the cold calculating evil guy from Return. Anakin's turn to the dark side makes no sense. He turns on a whim and then slaughters everyone in the temple. Jedi masters, who can all battle droid armies on their own, are killed after a few shots from clone troopers. Then, the acting and dialogue is horrible.