One thing some of you might be missing is that "balance" has many meanings or definitions! I think "balance" means to make things "right" again not to "make things equal". If the whole Star Wars idea has alot of basis in Japanese culture and beliefs , this theory fits perfectly!
Think about , say..."Karate Kid" when Miagi teaches Daniel-son about having "balance" and Daniel-son knows he must face his bullies to have "balance in life and with his girl.
So Anakin can (and in my opinion) does bring balance to the Force by killing the emperor/palpatine/darth sidious!