I know Kobe was a good defender, that's why I made the comment about Melo's defense. He's a scorer on a team with downright terrible offensive threats, so he shoots... a lot.
His passing is no worse than Kobe's (in fact, I'd say it's better) but who does he have to pass to? Hardaway, so he can miss another 3 pointer? Shumpert, so he can drive and fall over while throwing up something wild? Amare, so he can go into isolation just like Melo? JR Smith, so he can dribble around for 5 minutes and throw up a fadeaway?
Also, it's worth pointing out that nobody on the Knicks should be complaining about anybody else's defense, except Shumpert. They're all bad at it, and I'm not even convinced Melo is the worst.