Given its popularity on FF.net, you should be able to empirically state that whatever it is about Mary-Sue-ishness that people dislike he has avoided including. Isn't that really enough? Most of the people reading it are doing so for fun, after all. You might feel differently personally, or perhaps you wandered into a trigger without realizing it, but people are enjoying it.

I don't downvote for anything, so I won't downvote this.

Edit - please disregard this post