
Originally Posted by
Deftscythe
A lot of people attribute the drop in quality for dialogue/directing to two factors. First, during the original trilogy Lucas was this unproven guy so the studio and those surrounding him(producers, cast, etc) had no problem questioning what he did and giving him advice, whereas for the prequels he was looked at as this infallible movie god and allowed to do whatever without input. Remember that if he'd had his way in the 70s, Luke would've been an old man and Han would've been a lizard.
Secondly, his wife was supposedly a big humanizing factor for him during 4-6. She got people much better than Lucas and shared the insight with him. Also, I'm not going to go so far as to say being bitter over his divorce caused the romance in episode two to be weird and unbelievable, but it wouldn't surprise me.