Melo isn't that good. Can't remember where I saw the article that explained it (I think ESPN), but the basic gist of it was that Melo is good at generating a high volume of decent shots. The problem being that while they make his stat line look good, he was really just trading decent shots other team mates could be taking for his own, not making the team any better or more efficient. Haven't watched him enough to know whether or not to believe it, but I remember at the time I read it, along with all the statistical breakdowns, I thought it was a plausible explanation.