I think it is a guilty pleasure of mine, but I haven't read (or wrote) it for a long time (years). I lost interest when the fanfiction became all love/sex/marriage/babies. Of course there's non-fluff fanfic but it doesn't do as well with readership, subscription, or reviews. I think this put me off. It was almost like there was a predictable formula to write a popular fic, which I guess is good if you want gratification but if you want to write serious stuff that could pass for actual storyline (canon), then fanfic isn't probably the thing for you.
Previously read and wrote Criminal Minds and Grey's Anatomy fanfic. I preferred to write believable storylines hence why I've lost interest.