I hate having to sign up to a service to leave a comment on YOUR site. It’s supposed to be easy and quick.
I like name, email, and URL. That way I can fill in what I want. Don’t force your systems and disregard of privacy down our throats or people will simply stop commenting. Some might not care, nice, so make it optional. But if it’s the only way people can comment, some will simply stop to do so.
Like me, because I can’t be arsed to sign up to yet another third party service, Livefyre in this case. And because when I leave a comment I want it to link back to MY site, not to facebook or twitter, they already rule the internet enough, thank you very much.