As someone who had written some pretty dark stories, I like the tag system so I can warn potential readers what they are getting into. I write happy fluffy stories and I write some not so happy, not fluffy stories. I would hate someone to start to read Not The Sun or Unrequited and thinking they were going to get something like Geeks.
As someone who sometimes has trouble reading dark content, I also like the tag system. If I see a story that has a rape or abuse tag, it will not necessary deter me from reading a story, but I will take a good hard look at the writer and the storyline and see how much I trust them. For example, I will read anything @Valkyrie writes because I trust her writing. If it is someone new or that I don't know very well, I might nose around a little bit first. Just my two cents as a sensitive little flower
As far as the article goes, Comicality has great advice as always.