The sing at Chez Petric in the Haight has been uneven for a very long
time--- it was that way when I lived there over a dozen years ago.
I believe it's got a reputation of being an 'entry level' event
with not much in the way of expectations. Just kind of a 'come
as you are' thing. Perhaps there's just not much coaching. I also
kind of felt like folks were there to do their thing, not listen
to others' thing.

Do they still have the glasses made out of the bottoms of
old Michalob bottles?

Honestly, the SFFMC seems an entity unto itself; it's certainly
not the 'hub' of the Bay Area folk scene, as it perhaps ought to
be. At least not of the scene of which I was a part.