I like to keep my site as simple as possible. Sometimes though, I feel like a comment section would be useful incase someone wants to ask a question on a blog post or leave some constructive criticism. On the other hand, I dislike the idea of having to use third party commenting systems like disqus. I also think implementing my own commenting system and requiring users to provide an email or something to comment is a bit overkill. This is the option I would go with though if I was to do it.
Does your site have a comments section? Do you think it's necessary?