Make it easy to comment

I have been on a couple of sites recently where I have to log in on my Google account to comment.

I wanted to quickly put a comment, but I could not remember my password for my account. My fault. Yet, would it not be easier to enable readers to comment, with verification code, and then moderate if not unsuitable? I have only had an advert masquerading as a comment twice in over 300 entries and I do not recall one slanderous or offensive comment to date.