I'm a member of FFN, but fortunately, I don't do Mary Sues. Doing fanfiction is actually what helped me discover my passion for writing. However, unlike so many FFN users I've tried to respect canon and the rules of spelling and grammar. I write in one fandom which is notorious for its Mary Sues and fantards who pair up the male characters of that fandom with their shitty self-inserts. You have to slog through mountains of crap to find a story that is at least halfway decent.
Oh, and let's not forget that many of these fantards who do Mary Sues/self-inserts overreact when you give them constructive criticism. I've been called a bitch, dumbass, among other things, for daring to call fantards out on their... tardness.
I know the feeling.
There was a Fallout 3 fic that didn't have too bad of an intro, then quickly went downhill. I stopped reading after the rape threats the Tunnel Snakes were giving the Female Wanderer because SO EDGY. Oh, and Jonas is also an ephebophile and Amata is totes a super cunt who was never the Female Wanderer's friend and just used her for comfort sex.
I think that's another thing I am not fond of with some of these fic writers. Usually, a work is already kinda dark. For some, however, they feel like they need to use every "dark and edgy" cliche because that automatically makes it a good story or something??? Some can do it right because they understand you shouldn't toss in every cliche, especially without understanding why they work for others. These guys? Nope.
And let's not forget the yaoi fans who pair up every male who so much as say "hi" to each other despite their canon orientations or even the fact that the two loathe each other, because hating someone means you totally want to bone them.
I've tried giving my own share of advice, but... In the end, it's just a waste. So now I just point and laugh or facepalm at their stupidity. I've had this one girl go all emo, trying to make me feel sorry for her so that I would take back my review. She acted like she appreciated the critique then did a 180 and bitched me out, all but calling me worse than Hitler for daring to say that her work is anything but perfect.
She was even one of those who
claim they want critique when really they just want you to be an asspatter. After that, she said she doesn't want critiques.
I think one of my favorites is
Hells-Angel-Kanashii simply for the complete failure of doing the research and her angsty Sue being named "sadness."
There's also
this chick who thinks she's a great author. She wrote one high school drama story about her self insert then wrote a sequel about her self insert's daughter that was pretty much the same damn thing all over again. Her fics also have some logic fails and, I hate to say it, look like they're written by a fifteen-year-old girl.