A moderator closing a different thread and directing its discussion here didn't necessarily help.
As a quick note, Spelling and grammar are definitely an easy pet peeve. Not always the biggest problem with any single fanfiction, but yes it does feel like a lot of authors just don't try/care. A big part is that there's no authority to actually enforce good language in a writer's fic. Nobody to point out the flaws and make the author correct them of their own efforts.