I generally don't read the comments that go along with recs, I'll just read the story. So, I guess that means I use it as a way to find links. That being said, when it comes to my stories, I personally don't like reading criticism in a reccing forum. I appreciate if someone writes to me in an email to comment on my fic, or if the story is being reviewed or discussed in a forum intended for that, but a bad crit in a public rec can feel a bit like a punch to the gut. If it's about grammar or punctuation, I don't care. I know I slip up, even though I have a beta, everyone does. It's rare not to see at least one typo in a fic (I usually have at least one a chapter). But, if someone comments on my style or my characterization or my plot--no matter how glowing the rest of the rec is, that feels harsh.

However, in a personal journal? You can write what you please, because, as you said, it's your own personal thoughts. Of course, the author may never speak to you again...LOL!

Unfortunately, I think most fic writers have thin skins. I know I do. Those who are more out there with their work, who are published writers or artists who know the sting of rejection, I think they appreciate a good crit. So, in a public forum, they can handle it. But for me, I only appreciate a good crit if it comes in an email from someone I respect, or someone I like. Anyone else, I'll get defensive. And then question everything about the story. I've taken stories down because of one bad crit. Like I said -- thin skin.

This isn't a very comprehensive comment. Sorry about that. Anyway, just my two cents.