Things I hate :

1. Bad Grammar - please get a beta Reader. It's not TOO hard.

2. Bad Spelling - Spell check is your friend.

3. Out of Character - You make it seem as if its your own character with the canon character's name attached to it.

4. Mary-Sues/Gary-Stu's - Why must you insert yourself into your Fic to get with a fictional character?

5. Lame excuses - "Don't like it, Don't read it!"

Now if your Fan Faction has the positives to these, I'm sure it can be good.

I'm here to help you make your Fan Fiction better. Nothing more.

Just that I can tell a bad Fan Fiction when I see it. No need for hating. I'm entitled to my opinion just like you are.

So respect. =)