Alex Payne — Why I Don't Allow Comments, and More on Everything Buckets

Also I have a rule of not making a blog post unless I have at least a few paragraphs to write on a subject. So his "no comments" stance limits discussion in that way as well.

I hate to say it but I’ve found most of these "hit and run"" trolls usually leave comments that, while rude, have a grain of truth to them. They’re usually saying the thing that bloggers, who tend to worry about their reputation in the blogosphere, won’t say.

All in all I think the whole "no comments" stance is unwise if you actually want a true debate.

Sure, most people don't devote have the time to devote to maintain a full-time blog - but then they shouldn't expect to participate in meaningful conversations on the internet.