I wouldn't call him a bust just yet, but i will say he needs more time than i expected. Maybe its a cultural thing, but like Yao i think he needs to develop a sorta mean streak. He is a bit soft right now, and it appears he's losing confidence.
Dirk wasn't good one year after he was drafted, and took some time to develop. Yi maybe shouldn't be starting right now until he figures it out. He maybe a third year player who finally breaks out, but right now he's a bit soft, and a streaky shooter at best. Which in my opinion makes him sorta a liability on the court right now. Unfortunately for the nets none of the other power forwards are ready yet either. So we will have to live with the growing pains until that day happens. And, until that does happen we will have to live with a good game, then wait 3 or 4 games until he does it again.