The problem with George Lucas is that he surrounds himself during movie production with people unwilling to challenge his ideas, they all say yes and oh isn't this ridiculous idea visionary..
Take a look at the movie reviews in depth with the redlettermedia plinket review of them, besides being hilarious it has a point, the end of the phantom menace had 4 or 5 endings to it, you had the capturing the vice roy, the young annoying anakin flying his star fighter, the jedi's battling a sith (with no explanation during the prequels at all what a sith is, only that they are bad and that they come in two's) and lastly jar jar and his gungan army - All happening at the same time... You basically don't feel infested in the films ending as its switching between the 5 of them..
Not to mention the Love story that is forced on the audience between anakin and padema - Oh all of a sudden i love you, yes I love you too (out of no where) then the sad people killed my mother so i committed genocide on them, and the reaction from her is like oh well life goes on - He just committed genocide!!!!
Its not that he is bad at film making its just no one is willing to challenge on silly concepts anymore, stephen speilberg didn't on the last indiana jones disaster and you see the result - aliens, russians and the unforgivable casting of Shia Le boff.