My children and I go to Kaiser in Vallejo, my husband goes to Kaiser in Richmond. Overall I think the quality of care is fractionally better in Vallejo, but my sample is awfully small!
We are all very happy with our primary care physicians, and we LOVE our pediatrician at Kaiser, Dr. Katherine Lau. If she is accepting new clients, definitely try to get her - she listens to parents, takes your concerns seriously, and is very flexible on things like vaccination schedules,etc. Another wonderful pediatrician there is Dr. Margaret Ho. I can also recommend a nurse practitioner in the OB/GYN dept, Deborah Theisen.
In fact, the only negative experience I have ever had at Kaiser Vallejo was with their allergy dept, and really that was just a personality clash. Happy Kaiser member