I have to disagree, at least in terms of concept. Bart as Kid Flash had plenty of potential, and was a natural evolution of the character. Instead of acting on impulse, Bart did what he *thought* was the smart thing and hilarity ensued when he drove the Bat-mobile and tried to ambush Flash with something he read in a book.
Sadly, that's where the concept ended and Teen Titans began to focus on the Small Three.