Well, to be honest, I think it's the prolifieration of bad OC writers.

OC's fall into two catagories: Original Characters and Other characters. i write both, so I assume that both reply. Both OC's get -Sued so often that it makes your head spin, and well-written OC's are a bitch to find. I'll read them- if they're good. But honestly? They're mostly not.

However, I run hermiones_desk, a comm made solely to archive aspects of the HP fandom. If you'd like, I can set up a cat for OC-centered fics, if you need a larger list of recs.