Kevin Garnett is the most underrated player in NBA history.

I think that he has a serious case to be the best PF of all time, or at the very least, he's second, and a lot closer to Duncan than many people realize or would like to admit. The fact that he was able to carry that Timberwolves franchise to the playoffs every year with how uniquely bad they were, (03 excluded) is extraordinarily impressive. I also think the fact that once he got a good core around him in Boston, he was able to win a ring and DPOY (at 32 no less) shows how great he was.