For those of you who have blogs, this article may be of interest:
http://mattgemmell.com/2012/01/07/comments-commentary/
Personally, I enjoy most blog comments and think the comment function aids interactivity and conversation.
Obviously spam can be a bit of a nuisance at times but it's easy enough to delete it before it goes live.
Would you consider turning off comments or do you think they add to your blog?