The prequels were a disappointment for many people. Lucas had nothing but yes-men working for him and he went right off the rails. But since he was kind enough to sell out to Disney we will get a chance to see another take on Star Wars. Looking forward to it.
Pretty much summed it up.. the OP also mentioned Jar Jar so he's aware of the many shortcomings of the PT movies.
Lucas is awesome at creating worlds but he just doesn't cut it with today's audience which has grown beyond simple candy visuals. His movies are pretty good for kids who can still be amazed by cool special effects, cool characters and the occasional silly humor but his movies don't stand up to an adults' more critical eye and it is a good writer who can please both. George is not one of them unfortunately.
And he's also a bad director.. he has top acts like Natalie Portman, Liam Neeson and Ewan McGregor and managed to get some of their worst performances out of them in their careers.
Best scenario would have been George being the producer and creating the world but have talented people take over and play within his world with no restrictions.
This is why i have so much hope for the Disney movies (if only Abrams would let go of his lens flare fondness