Well, I finished The Reichenbach Fall. But I think I've made it plain what I found unacceptable about Sherlock. Enough beating a dead horse. Call the knackers.
M's true identity didn't occur to me beforehand. But every moment I saw him before the reveal, his identity as Moriarty was unbelievable and unfitting. Thus the denouement made a great introduction to the true Morariarty, who is still left conveniently left off stage, for now.