In a way the whole practice of fanfic itself is concrit of the originators work - fixing holes in canon, telling the author that they really should not have killed off that character, reconciling the several different versions of the origin of the Daleks...

So we really aren't in a position to complain when anyone else points out the holes in our work.

Though I admit that sometimes I am tempted to overlong Authors Notes in order to spell out why I'm messing with canon.