I've just watched it.
The portrayal was absolutely chilling, but considering the subject matter, it was also done fairly sensitively. I didn't get the impression that the BBC was let off the hook, because it was absolutely blatant how they were so interested in damage limitation to the Corporation that they gave Saville 'the benefit of the doubt'.
It struck me, too, that at the end of his life he still wanted attention. He always pushed Daniel away when the journalist got too close to the reality, when the pose as a Sphinx-like master started slipping ... but cajoled - teased - him back with promises of 'truth'. It seemed very familiar with Ian Brady's last days when he tried flexing, teasing the authorities.