If you’re saying Doyle is coming down on Holmes’s side, then it might seem clear in The Sign of Four — but that attitude seems to be strongly contradicted in some of the later stories. I can’t remember the titles, but ISTR there’s one where Holmes nearly kills himself with cocaine. Later, Watson says he’s actually managed to get Holmes to stop, at least temporarily.
If you’re saying Doyle is coming down on Holmes’s side, then it might seem clear in The Sign of Four — but that attitude seems to be strongly contradicted in some of the later stories. I can’t remember the titles, but ISTR there’s one where Holmes nearly kills himself with cocaine. Later, Watson says he’s actually managed to get Holmes to stop, at least temporarily.