I don't know why people are so obsessed with Star Wars back stories. The lack of back story for the characters doesn't make a movie bad. Take the Matrix for example. This franchise never really revealed much of the back story of the characters, not even the back story of how The Matrix itself got created! Even with it's big lack of back stories, people still love this franchise. The Matrix is arguably one of the best action movies off all time, and people never really cared about the back stories of the characters. They just enjoyed the movies as they were. So, the lack of back story for a character doesn't make a movie bad by any means. It's just the fans that want way to much from Star Wars, not Star Wars that doesn't offer enough.
In my opinion The Phantom Menace was the best out the prequel trilogy. I actually love that movie, to be honest. I never really understood why people hate JarJar so much.