I can't believe I'm arguing with someone who thinks my story is perfect, LOL, but the fact is, my story flubs canon in a few areas and really isn't right. It's not like I reject the whole thing -- but if I were to write it again, I'd get us where we were going slightly differently, in a manner that was really consistent with canon.
Once I got to Decisions, I had seen the fifth season enough times that I'd gotten it, so after that, I have no problems with what I did. But it just reinforced for me how important it is that fic writers know the source material inside out and backwards. Otherwise it's far too easy to let fanon and meta influence us.