What really stands out to me about the prequels is how cartoon-like they are by comparison to the original trilogy It's not simply the special effects or characters such as Jar Jar, but also the story - that a mass battle can fought by throwing magic balls, or how a great space station can be destroyed by complete accident, let alone how not a single person on screen can spot the looming bad guy that the audience can identify the moment they see him. It's all something of a long way from the sense of epic that introduced Star Wars.
Better than all the prequels and new Star Wars films combined.