The thing I hate most are the very young, inexperienced characters.  How can a 14 year old girl, with a 'small body build' wielding a large sword hope to defeat my 30 year old warrior who uses a classic shield and sword?  I don't know... this happens more often than not, but more in the past.  It really irks me.  I think they get these ideas from anime and manga or whatever those things are.