I thought the cgi backgrounds in Kingdom of the Crystal skull jungle scene look fake and awful, i guess they deserve credit for them being less awful than that fake background in attack of the clones.
At least in crystal skull the plates were shot on location by a photographer and then cgi in.
In Attack of the Clones that whole scene is faked in front of a green screen, no real sand or location. Lucash obviously did not want to shoot backgrounds in Tunisia.