In a way, I agree, but, in a way, I don't. The term "Mary Sue" has been over-used to the point where it both has no meaning and has become such a constant spark of paranoia for writers that it's handicapping them in terms of character developement. :/ It's amazing how both a perfectly "normal" character and an extremely "over-powered/too pretty" character can both be labeled "Mary Sues". I mean, what the heck do people want? Some so-called "Mary Sues" are actually really good, well-developed characters. but because one troll decides to complain about them, the readers turn on the story. In reality, most canon characters are Mary Sues/Gary Stus. Dante, Vergil, Harry Potter, 95% of comic book characters. But because they're written well, we over look it. So, really, what people are complaining about is the writer...not the characters.
Besides...aren't all characters extensions of the writer? Just because they don't look like you or act like you, doesn't mean they aren't still a part of you. *mutters*
Sorry for ranting at you. ._.