If anything, I think the prequel plots are more intricate than the individual plots of the Original Trilogy. The problem lies in fewer likable characters, and the charaters that are there are... well... less likable, along with poor dialogue, which can produce poor acting even in good actors.
Think about it: does anybody watch A New Hope for the intricate subleties of the plot? No... we watch it because of the character interactions and the space battles.