Well, Lebron made it TO the finals with a team full-o bums. If Carmelo did that, the heat would be off. But, it's not really even a matter of making it that far. It's the way Carmelo plays, and the fact that he came into the league concurrent with the league's best player, and at similar size/skills.
Carmelo's problem is style of play. A better coach would help him, but it would take a very commanding presence — Phil, Riley, Popovich — to change his ways. I love the guy, and every year, he just keeps giving back to the University. The recent deodorant/boxing commercial with the SU t-shirt is awesome. But, he plays an easily criticizable (?) style. When he's hot, it's a thing of beauty. When he's not, it's ugly and kills the team. I can't think of any other player who has that sort of effect, with such profound significance. It may be that he just trusts himself over the team concept. More likely, though, he's just got it in his head that he's competing against other issues — other than the opposing team. And the Lebron comparisons are in his psyche.