This team will only go as far as Harden will take them because of the Dantoni system. Harden has the ball 80-90% of the time being the point guard and plays the most minutes. He is the head of the snake and the offense can become very predictable and dead (when he turns the ball over) with him at the point. So its really Hardens, Dantoni and Morey's fault.
I blame Westbrook. If OKC had just beaten us in the quarterfinals, we would never have been in this situation in the first place
Not to mention Westbrook beat Harden in the number of triple double in that series. That must have broken Harden's spirit beyond repair.