When I reinstalled Moveable Type in the aftermath of the November Random Thought Meltdown, I was looking forward to the comment-handling capacities of the new version of MT. Even without Blacklist, which I expect I’ll install someday but haven’t gotten to yet, MT 3 promised to be a great deal more manageable realtive to unwelcome commercial comments than was MT 2. I’ve found my expectations amply fulfilled; it’s indescribably easier to find, select, and delete unwelcome comments.
There’s a cost, of course; the intervention of comment moderation probably damps the willingness of some visitors to leave comments (that was certainly what people said when SixApart introduced TypeKey), and I understand that. We’ve already seen visitors leave duplicate comments, since they weren’t sure that their original comment had been recorded. Moreover, I’m sure it’s frustrating to write a comment, only to see it disappear into a pending-moderation void. I wish I could conveniently pre-approve the regulars, so my friends could post directly, without awaiting moderation (presumably they could register with TypeKey, but let’s assume that they’ve already considered and declined that option). Commercial comment-bots would soon develop the capacity to spoof approved identities, anyway.
Short of a comprehensive solution to DigID problems (on which David has a cogent side-commentary at Worthwhile), we’re left with more or less satisfactory half-measures. So far, the frustrations that accompany comment-moderation don’t outweigh the ease with which the new version of MT fends off unwelcome commenters.