Knowing when to just keep your mouth shut

So, is there any polite way to tell a fic writer, "My, you seemed to have based your entire fic around a huge honkin' Mary Sue" or do you just assume they don't really want to know any better and remember to avoid any future fics by that writer?

Parting of Wai? No wai!

Wendy Shaffer gives us "The Parting of the Ways" as cat macro.

I find this especially amusing as I just watched this episode again last night.

I need that *headtardis* panel adapted into an icon. Need, yes.