I don't think there's any objective way to put Kobe outside for a top 15 all time. Ranking guys like Pierce, McHale, Iverson, Erving, and Hondo over him reaks of bias.
On the other hand, he's generally overrated as a lot of (most?) basketball people have him as a top ten guy but I don't think enough attention is paid to the fact that he robbed his own team or a championship in '04 because he wanted to be the star of the show. That knocks an otherwise top ten career back some notches. Still, he's a no-brainer, first-ballot HoF'er.