I am a new fan.  I first watched the show in 2012 on Netflix with my son, but because of the length of the episodes I did not get past Season One.  Now that my son is in college and I am slightly less busy, my husband and I have watched all three seasons, and I've been going back and re-watching favorite bits.  I cannot wait for Season Four.  I read a lot of the original Arthur Conan Doyle canon long ago and need to go back to it, but have other books in hand right now.

I enjoy sharing ideas and theories here.  I tend to take the writing at face value; thus, I do not believe John and Sherlock are or ever will be a couple.  John repeatedly makes it explicitly clear that he is not gay.  He doesn't seem to be insulted by the idea or nervous about it; he's just not gay.  I have no idea what Sherlock's sexual orientation might be, but I don't think he has ever had such a relationship or is likely to have one soon.  Heck, John is his first real friend, and he still screws that up semi-regularly.  Give him time.

With Mary, again, I take the writing at face value.  She is a complex character, certainly, but I don't think she's a villain at all, and I will be most disappointed if they make her one.  I am hoping that the three of them will be working together from now on, with John and Mary both involved in cases and both involved in child care.  Just hoping the baby doesn't spend most of its life being kidnapped!