7: JarJar was MUCH more annoying than the Ewoks. In fact, nothing in this galaxy, or any other galaxy, far, far away or not, could be more annoying than JarJar. Meesa soooo sorry iffa youa don'ta likea meesa now...
8: The Empire didn't surrender. There isn't anything to suggest that they did. You see the Death Star explode, and then the celebrations on Endor. Of course the Rebels are going to celebrate the death of the Emperor and the destruction of the Death Star (They did in "A new Hope" aswell)
Not sure if I agree that ROTJ is the weakest of the three. I love the Emperors character, he is such a great baddie. Do agree that ESB is the best though. If we are including the prequels, then TPM is by far the worst. There were so many things wrong with that movie I wouldn't know where to begin.