On the other hand, ACTransit from Oakland to SF is really quite good for commuting.
This was with being one of the last stops before SF and having a good onramp to get onto the freeway. I tried taking it from the east oakland hills when I lived there and it was completely unpalatable.
I ride the F, which is a "normal" bus, but it's 10x better than BART for comfort, temperature, smell, etc. The trip takes me 40-50 minutes on a normal day.