I build WordPress sites for small businesses and such. I have to say, the first thing we install is a plugin to disable the comments. I'd say maybe 1% or less of the hundreds of sites we've built actually have comments enabled. For us WordPress is a CMS first, a blogging platform second. While many see that order reversed out of nostalgia I don't believe that is why it's used by 40% of the internet at this point. The comment system should be revamped but having it as a modular system would make the most sense as WordPress matures. It's grown beyond being just a blogging platform.