It seems the complaints fall into very specific areas, some understandable, some matters of taste, some inexcusable.
I have close to zero tolerance for the story that hasn't seen both a spell check and a grammar check. Those programs aren't perfect, but they'll catch a good 85% of all the goofs. I do not have a problem with the writers making the goofs--non-native speakers, people with learning disabilities, people trying to write on their phone or using voice may have great stories to tell--but I'm irked when they don't bother to find and fix them.
Like others have mentioned, I won't--maybe even can't--read a story that's a brick of text without paragraphs. Same thing with a complete failure to proofread--and our devices are so quick to stick in the wrong word based on a few characters! I want authors to read and fix that.
What the reader wants in a medical fetish story clearly depends on each reader. Some want sex, force, slang, humiliation, etc., and some don't. Some want everything very realistic and clinical, while others want the fantasy that only starts out that way. It's easy enough to stop reading a story when it stops being what I like to read.
For me, the sexualization of children, force, or violence is inexcusable.