Well, a lot of the Naboo stuff was filmed on location in Italy, so that's why it was so breathtaking. Mustafar reeked of CGI, though. I don't really remember Kashyyk, as I blanked out during that pointless Wookie battle, but I remember that Geonosis was a disaster. Kamino was pretty cool, though, but there really wasn't much planet-wise to duplicate there. Water.