You guys do realize that Durant averaged 29.8 against memphis right? He still got his, there was no "shut down" it's just that between Westbrook and Brook's terrible offensive sets he wasn't able to get the ball ENOUGH. Difference.
Melo shuts himself down with his game, he's HORRIBLY inefficient and he doesn't even play elite defense to balance that out like Kobe did in his championship years.
EDIT: And LOL at CP3 shutting down Durant. He didn't shut Durant down, every time CP3 guarded Durant in the high post it was actually a double. Once Durant figured out how to beat the double team you saw him rise up over CP3 for a dagger (after Russ hit his own 3)