Yes, FaceTime's quality is really good most of the time. Far better than Skype, in my experience, but FaceTime is 1-to-1 only.
AIM accounts on Messages, however, can still do up to four-way video calling, just as iChat used to do.
I thought I had read somewhere that non-Google people could join a Google Hangout video chat, but the initiator of the conference must be a Google+ member. I have a Google account but again would rather avoid using it. Ah well, I wasn't available for this Sunday anyway ...