2. I only answered one question, and as that one answer was flagged, I don't actually think it was still visible on the site to other users. And even if it was, everybody (especially myself) seems to agree that it was not helpful. So what would be the harm if I had the option of deleting my account?
3. Who am I and why does my opinion matter? I can't answer that. I blog. You like it, you don't like it. You upvote or you don't. There are no rules about who is and who isn't fit to opine about anything at all. That's the beauty and the hideous reality of the Internet. I would never suggest that I have any particular qualification for writing words except that I do write. The same goes for software.
4. I have no problem whining about how Quora isn't a community in my blog. And you have no problem whining about my blog post in a public forum. We seem to have a lot in common, maybe we should be friends.
UPDATE: I should make something clear: I have nothing against Quora. I am not predicting its demise. From what I have seen of SO, such sites have a lot of potential and perform a valuable service. All I am saying about Quora is that I realize that I am looking for a social experience, and Quora is looking for answers to questions. That's not a bad thing, just not the same thing.