I recently closed a ticket on the MinGW Project bugs-tracker; I deliberately *unchecked* the "close for comments" option, in the new tracker UI.
Today, I followed an e-mail link back to that ticket, before I'd logged in to my SF user account; the ticket showed "Comments are closed for this artifact", even though I'd explicitly requested that they be kept open. (FWIW, I've previously mentioned to David Burley, that I think keeping comments open after ticket closure should be the default, at least for some configurable period after initial ticket closure; to me, immediately closing the commenting facility, on initial ticket closure, seems like "antisocial behaviour").
After I'd logged in, the commenting facility was again shown as open, for the ticket in question; this is the state I expected.
I think it is confusing, to show the commenting state as "closed", prior to log-in, when in fact it is "open", but simply requires a log-in to access the facility. No, I don't want anonymous comment postings, but the old tracker's "please log in to post comments" style message makes more sense in this context; "comments are closed" should be reserved for the case where they really are.