The problem isn't that Nurk is slow and can't guard quick and athletic big men like McGee. The issue arises from penetrating teams that also have a quick finishing big man. What is Nurk supposed to do when Rondo is allowed to just stroll right down the lane time and time again. If he helps too much McGee has a dunk. If he doesn't come out far enough, the penetrator has a lay-in. This is a break down of the perimeter defense, not the interior defense. How about going under picks against a poor 3 point shooting team instead of letting them pound the paint all game. Nurk's gotta play better but his teammates also have to stop leaving him on an island against 2 players.