The only way Chris Paul deserves blame is for allowing Game 6 to unfold as it did. That said, claiming that CP3 is overrated and citing this series as proof pretty much reveals that you weren't paying attention to this series.
Blake deserves a huge amount of blame for shrinking in fourth quarters over and over and over again. That said, that happened because he was exhausted. That doesn't excuse his Game 7 performance, since he was largely invisible, despite putting up numbers.
DeAndre deserves a TON of blame for being a godawful free throw shooter.
The role players deserve a ton of blame for being absolute trash in the last three closeout games.
But the person most responsible? Doc Rivers. He's not only the architect of this team, but the Game 6 meltdown occurred under his watch.