Ways to avoid writing badfic
-Capitalize the first letter of each proper noun (characters' names, cities, countries, and the like).
-Place punctuation at the end of each sentence. If you have a sentence without punctuation at the end, ADD SOME!
-Keep the characters in character. For instance, everyone at Torchwood likes Gwen. They aren't going to suddenly turn on her, call her names, and laugh when she dies. If you write a story where that happens, you've written an awful story. Another example: Ianto is not going to cry over his relationship with Jack while listening to bad pop music. He is not a weak, sobbing character who would do anything remotely close to that.
-If your grammar is bad, get extra help at school. Or ask a friend who's good at grammar to check your stories so you don't post something that's full of mistakes. Or find a beta reader (plenty are available through this site). Same deal with spelling and punctuation.
-Don't use Mary Sues. A Mary Sue is an original character (one created by the author) who is basically perfect. Typical Mary Sue traits: He or she is extremely attractive and smart, possesses special abilities the other characters don't, saves the day without any help, has a mysterious/dark/sad past, is the long-lost child/spouse/friend/enemy of the show's lead character, etc. For instance, if you create a character who is Jack's long-missing daughter, instantly joins Torchwood, befriends all of the characters, has bronze hair with a purple streak in it and glimmering eyes that change color depending on her emotions, can read people's minds, is a better doctor than Owen is, and is the only one who knows how to defeat invading aliens, YES, you have written a Mary Sue. And YES, I will laugh at you. So don't do it.
Spell check all stories and poems. There is no excuse for not doing this. Proofread all entries for grammar and other aspects of writing before submission. "Hot off the press" content is often riddled with errors. No one is perfect but it is the duty of the writer to perform to the best of his/her ability. Respect the reviewers. Not all reviews will strictly praise the work. If someone rightfully criticizes a portion of the writing, take it as a compliment that the reviewer has opted to spend his/her valuable time to help improve your writing. Use proper textual formatting. For example: using only capital letters in the story title, summary, or content is not only incorrect but also a disregard for the language itself.
Entries not allowed: Non-stories: lists, bloopers, polls, previews, challenges, author notes, etc. One or two liners. Stories with non-historical and non-fictional characters: actors, musicians, and etc. Any form of interactive entry: choose your adventure, second person/you based, QAs, etc. Chat/script format and keyboard dialogue based entries. MA content.