So yeah, like I said, I am saddened to see your agents and missions removed from continuity. Not just because I liked them, but also because I prefer to see everything archived for future readers. Seeing something be lost from the internet forever is sad to me. That said, these are, of course, your ideas, and you can do with them what you will.
I find that even if I had some writing online that I was embarrassed of and wanted to not be associated with, I would prefer to move them somewhere else that isn't with my main writing, probably with a disclaimer that it isn't representative of my current work. Unless there's some gross moral issues with the work, I just don't think full removal is necessary.
I don't think it's hypocritical to necessarily point out the flaws of bad writing while having issues yourself; no one is perfect. I do think that is what beta'ing is for; helping you catch issues you can't see on your own. I don't think a PPC mission has to be perfect; the goal is simply to be better than the work being critiqued, and up to the community standards. Everyone makes typos, and I don't think anyone is ever perfect. You shouldn't need to hold yourself up to such unrealistic standards.
Sometimes people do waste time and energy on something that is, objectively, bad. But if no one points that out, how are they supposed to grow as an author? I think that in order to better your ability to write, you have to be able to take criticism and realize when you've made something bad. If someone has some awful first knitting project, you shouldn't loudly yell at how loud it is, yes, but I also don't think you should lie to them and say that it is good when it isn't. Like Geema, I can appreciate the work put into something bad, even if it has a bad end result. But being able to kindly and constructively critique something is, in my view, the best and most appropriate way to respond to something like that.
Yes, there absolutely is a way to give feedback to an author better, but I don't think a PPC mission is that way. Trying to give constructive criticism in a kind, reasonable way that makes clear exactly what does or doesn't work is a delicate balance that usually doesn't work in an MST or PPC mission, where the intent is more to entertain one's own friends and audience. A PPC-style critique might indeed stop someone from writing; which is why we don't solicit badficcers to read our missions. The PPC is a pretty private corner of the Internet with its own rules, and (nowadays at least) we absolutely don't and shouldn't try to take it outside of that. I think choosing to tailor your critiques to your audience is indeed a good thing.
Insofar as "don't like, don't read" applies to fics, I think it replies to reviews as well. Don't want to hear what someone's take on your fic is? Ignore it. Don't respond, don't think about it, block it if you have to. There is absolutely such a thing as bad reviews, and I think that they are best ignored. Did someone leave a low-star review with no elaboration? Did someone share some arbitrary standard they hold fics to? You can just ignore them and block it.
Anything posted publically should be allowed to be criticized. I don't think unsolicited critical feedback is something that should be discouraged. At the end of the day, is some dumb fanfic that totally ruins LoTR's worldbuilding with a plethora of typos the worst thing ever? No. But neither is a "bad" review or criticism, and I have the right to point out its flaws in a humorous way if I want to.
Maybe there are some people who aren't equipped to share their work publically because of insecurities or whatnot. I would tell such people that they should probably stick to sharing their work with friends.
TL;DR: Anything posted publically, be it work or review, should be allowed to be talked about or ignored. If you don't want anyone's perspectives on something, don't put it where anyone can see it. If you don't like something, you can just ignore it.
TL;DR of the TL;DR: I agree with Nesh.
--Ls