The vast majority of fanfiction contains Sues in one way or another, so the character type's association with bad writing was unavoidable. Sues are symptoms of bad writing, but bad writing itself, and bad writing in general, are what the PPC community addresses in missions. A disproportionate amount of missions involve Sues because, again, that's the shape of fanfiction. But missions are more about pointing out what works vs. what doesn't work in the story.
But, of course, the real topic here isn't Sues themselves, but whether writing them is "okay" for authors. And quite honestly, that argument is irrelevant in this community; we don't inform badfic authors of missions into their stories, and we certainly don't attempt to dissuade anyone from writing anything. Missions exist only as part of the fictional setting of PPC HQ. If a fanfiction renaissance ripped across the internet overnight tonight, and fanfiction quality took a huge upturn, I myself (and probably many other writers in this community) would craft artificial badfics to send my agents into, as a backdrop to my own continuing plot lines. The badfics aren't the point; the points are our characters' growth under strain, our intertextual cooperation between authors in our community to build stronger stories and a stronger setting, and our ability to find humor in bizarre moments we came across when looking at fanfiction on the internet.
Now, for some thoughts that are more distinctly my own than the general community attitudes above. Firstly, in the original post, ladydragon76 mentions, "I promise you, typos and bad formatting included, fandom NEEDS every last one of your creations." Learning correct spelling, punctuation and formatting (and, most of all, learning to DOUBLE-CHECK one's work—I've made numerous typos so far in this post, but I backspaced and corrected them immediately after I saw them) are important in real life, not just in fun writing. I frequently get texts or written notes from coworkers filled with chatspeak, abbreviations, typos and incorrect grammar that confuse me and slow down my ability to respond or carry out instructions. It's imperative that all young people growing up now learn correct writing format in order to communicate effectively in their future careers. Learning those tools, and putting them to good use in fanfiction, will only help them down the road. Disregarding the rules of writing only teaches bad habits they will need to unlearn as adults.
Secondly, while writing fanfiction is fun, I personally wouldn't bother with it if I wasn't going to put my every greatest effort into it, and make the final product as perfect and professional as I could. To put it more generally, there's no point in doing something if I'm not going to do it right. As an admin on our wiki, and one of our active members working to make backup copies of older works for future rehosting, I treat my PPC hobby with as much careful attention to detail as I do my actual, paying career. This is because, while I do them for "fun" (or at least, working on them and being able to show quality results makes me feel accomplished and valuable), "fun" does not mean shoddy or quick work, but rather complete, professional efforts I can be proud of. I see no reason to expect any less from anyone else.
—doctorlit, letting his philosophy show a bit