They have many good ideas that were rather poorly executed, but overall are more a victim of people misremembering the quality of the original movies. As much as you can complain about Hayden Christensen's acting (which has more to do with having impossible-to-deliver dialogue than any actual problem with his delivery), do you remember Carrie Fisher's acting in the original trilogy? She was horrendous and was one of the main characters with tons of screen time and yet everyone gives her a pass for some reason.
This is an excellent point. Let's be fair, the prequels were never going to live up to expectations. And people get angry at Jar Jar for the same reason they get angry at Ewoks - it reminds them that this is a series of movies for young children.
Poll
