Of course, another director, totally trusted and permitted to call his own game, would have helped in a lot of ways. Then again, that director (insert name here) possibly would have gotten some things wrong Lucas actually managed to get right.
There are larger problem with the PT - bad dialogue, an unclear and poorly researched story, overdoses of effects, pandering to certain demographics. How can the most skilled director possibly rescue a patient so horribly ill?
No, in a very literal sense, George Lucas was the best choice to direct the PT such as it is.