The best part of commenting is that you can comment as guest or registered user, it's really simple! I don't like how when i select "commenting" at the top right corner of my page there are some links which redirect me to other pages instead of staying with the one where i was before clicking on those buttons. I think this is not an error but more than likely those options should be placed in the same place so we could link them all together easily. It's very easy for anyone who doesn't know about comments to use them. We have been using them since they were first released by wordpress. Our users love being able to comment without having to register and log-in, plus our site looks great now.