All comments are moderated. As a general rule, all comments will be approved as long as they meet either of the following two criteria: (1) they're offered in goodwill, (2) they're not anonymous.
Put another way, criticism from anonymous writers will not be approved.
Criticism from non-anonymous writers will be approved (the TDE will also reject comments that are inappropriate for any obvious reason, such as obscenity, incivility, etc.).