I'm going to rant for a bit here.

I have some things I don't like when it comes to some categories of fanfics for instance in harry potter some authors try to make hary OP from the beginning or try to make him dark/light/grey and also the pairings get repetitive after a while like harry/hermione or harry/Ginny or harry/daphne are real common pairings for harry what I would like to see is for someone to think outside the box when it comes to a pairing for harry.

One thing most authors forget with fanfics is that they are literally god when it comes to their stories.