OMGosh, me too!!!
Why would I kill him? I just find him very whiny, indecisive, and wishy washy. The broodiness would make me stabby. I prefer hot headed and impulsive.
I won't say fanfiction ruined Harry Potter for me, but it definitely changed my reading experience. I was a little disappointed with how this whole fan fiction world had crowded into my head the first time I re-read a HP book.