I love YJ, but it had some odd design choices that came back to bite.
Some characters were not fleshed out, like Tim, Wonder Girl, Bumblebee and Rocket. Then again even if they had the bandwidth to do the characters justice, they should have stuck with S1 core with minor expansion for another season JLA style. Finally, Superboy's stunted growth arc went nowhere and Deathstroke just went poof, WTH?