I understand a lot of what people are saying here on both fronts.
On one hand yes, Melo is a bit of a black hole. Yes, his defensive effort is often...questionable. Those aretwo legit weaknesses in his game.
On the other hand, Carmello is truly an elite scorer (top 5 easy) and is a guy who demands double teams. He cabshoe in the post, in isolation, from three, off catch-and-shoots, you name it He gets to the line with regularity and puts opposing defenses in foul trouble. He's an outstanding rebounder for a small forward and has the versatility to also pay shooting guard or power forward, whichcan cause major matchup nightmares. Hegets crowds in the door. More importantly, he is tough. He's not one of those sissy new age guys like LeBron and Durant. He'll pay hard through injuries, he well always play with 100% effort, and he has that 'desire towin' that Boston teams love so much. He's a guy who can go toe to toe with a LeBron or Durant any night.
I don't love him as a player, but I respect him as a player. As much as I dislike chuckers, Carmello really is a beast and he really is the epitome of what this team needs (one of the things - the other being a great big).
People say his defense sucks, but look at the other leading scorers out there - Durant, Love, Curry, Rose (when healthy). They all suck on D. The only exceptions are George, Westbrook (an even worse chucker than Carmello) and LeBron, and you aren't getting either of those guys.
Look at last champions and you'll see you really do need an elite scorer to really compete for a title. There might be the odd exception, but is pretty much a statistical given.
Plus Crawford is one of the worst chuckers on earth and a horrible defender, and Celtics fans loved him here. Compared to Crawford, Melo is a messiah