Episode 1 showed the world that Lucas had long forgotten what made his original creation so loved. A film about tax disputes staring the worst child actor of all time and the most annoying rubber CG alien sidekick ever created? What a great idea!
Episode 2 showed Lucas attempting to fix the mess he had created, but whilst he sidelined the rubber CG alien, he replaced the worst child actor of all time with the worst adult actor of all time. It's telling that Hayden Christensen's career vanished without trace once the prequels were over. He's a truly awful actor. That said, not even a good actor could salvage the mess of plotting Lucas came up with.
Episode 3 was Lucas' last attempt to pacify the fans, filled as it is with fan service. Hayden still stinks the place up, and his transition to the dark side is stunningly unconvincing. There's wall to wall CG and blue screen of course, which still looks totally unconvinging, and lots of derivative action scenes which fail to engage. The finale, long awaited by fans, is truly awful. After a horrible blue screen lightsabre fight we arrive at the infamous "noooooo" scene, where the fully suited Vader is made to look like a spoilt child. Lucas managed to destroy even Vader with this miserable trilogy.
All of these are one star films. So much money was spent on such poor scripting, acting, and blue screening. Fortunately Lucas is now gone, but this miserable trilogy sadly remains.