In the only authorized biography of Grand Duchess Olga Alexandrovna (Nicholas' younger sister), GD Olga did, in fact, blame her father for Nicholas' unpreparedness for the throne. She said her father, when approached by his ministers about putting Nicholas on the State Council, derided them for even bringing it up. He asked whether any of them had ever seen a single serious thought enter his head.
(The reputed hide-away was at the Tauride Palace, where Marie Feodorovna was said to have kept a suite of rooms ready for herself and the children when Alexander's drinking got out of control.)
At the other end of his life, when Alexandra was debating whether or not to go with Nicholas from Tobolsk to Ekaterinburg or stay behind with Alexei, she was overheard by the commandant of the guard muttering about Nicholas doing something "stupid" if she let him out of her sight.
No one who knew the man at close quarters was ever impressed with his decision-making ability. It's hard to tell the chicken from the egg. Did Nicholas have no confidence in himself because he was surrounded by domineering, abusive individuals? Or did people assert dominance over him because they saw or sensed an incapacity for sound judgment?