The woodchuck suggestion? You typed it, so the rest of it can just copy and paste.
But I mean they were fans of ACD and Holmes at the beginning, but I take your point, season 4 is fanboys gone wild.
I liked the way they took the original stories and tweaked them, there is only so many times I can watch the same story being retold before I'm dying of boredom, I don't need yet another faithful Hound adaptation for example. But I also don't care about bit characters and those entirely invented. I think that's why I dislike season 3, too much Mary.