The cinematography was sub-par, and the pacing and story got screwed over due to Studio restrictions (no duel in the core of Coruscant, no assault on Coruscant surface, no wookie army etc).
The cinematography in Revenge of the Sith was stunning. Granted, the CGI become dated VERY quickly, and the actors probably gave their worst performances they had ever given in their career (save for TPM and AOTC), but the pacing was well handled, and the locations were breathtaking (unlike the red-wood forests of California - again thanks to Fox - and the very plastic-like set of the Death Star).
It was such a shame. Anyone know why Fox place such restrictions on ROTJ? I know some of it was to make it more kid-friendly, but why cut down on budget when the film was going to gross millions more then the proposed budget?