I was in downtown whent the last CM rolled through, and they went up 4th (I think) and turned on to University (or was it the street before?).
It seemed like a pretty cool vibe, but the guy 'blocking traffic' at the light basically planted himself right in front of the cars - about a foot from the front bumper - and turned right to face them. He had a really aggressive stance. He looked young, maybe 20, and had a big curly afro. He didn't have a 'thanks for waiting' sign, handouts, or any of the stuff I've seen from the SF Critical Mass documentary.
Anyway, some folks in the restaurant muttered. One said 'yeah, they just ride around and block traffic.' A few scoffed. Everyone else was curious.
I wonder if CM really does any good here.