Re: Shivers She makes too much mistakes, plenty of people don't like her, every single one of her mistakes has disastrous consequence, no-one cuts her any slack...
But Dick still sticks by her, in spite of all internal storytelling logic and the character's own common sense to the contrary, no matter what she does, which makes her The Sue Who's So Special That She Can Steal The Canon Character Away From All His Friends (see also: a significant percentage of Harry Potter fanfic).
[...] even beyond the meta that she's a canon character and thus can't be a Mary Sue at all.
And you need to go on TV Tropes and look up "Canon Sue" and "Villain Sue."
I'm not sure I wouldn't be making the same arguments that I'm making here.
Really? Even if the name on the cover wasn't "Devin Grayson," whom you consider a "goddess among writers"?
There might be less people arguing that Male!Tarantula would be Sue, though.
Ask Chris Claremont how well that assumption worked out for him with Thunderbird III.