He's a great team defender, but he's terrible man to man. Leave him out on an island against a good offensive player and he gets torched, constantly.
In this zone era, he's amazing, because of his length and athleticism he can get into passing lanes and disrupt a team's offense.
But calling him an all time elite defender is terrible, come on guys. The other 3 players (MJ, Kobe, Pip) if you said, I need you to get me a stop on this possession, they're going to get that stop most likely, even if they get iso'd against a top level offensive player.
Chase down blocks don't make a guy an elite defender.