The visual effects were amazing, the movie was beautiful, and yes, Ms. Weaver was doing well for her age. But, "flux vortex?" Come on James Cameron. It was the most formulaic plot I've ever seen, and the dialog and acting were horrible. And none of the characters were interesting in any way. It was basically a bad version of Princess Mononoke with blue cats in space. Or as many people have said, a combination of Fern Gully and X (Pocahontas or Dances with Wolves or the Smurfs or Thundercats or even just the bad parts of Return of the Jedi).

All in all, I would place it about equal with Revenge of the Sith, just because the effects were so awesome. Though with time it will probably sink to below Phantom Menace as none of the fight scenes were as cool as light saber duels and none of the characters were as memorable as Qui-Gon Jinn or Darth Maul. Though none of the characters were quite as annoying as little Anakin Skywalker or Jar-Jar, so maybe it'll stay above it. And the movie was never really boring even though it was so long, so that's a plus.