Pros
I can speak for the division I worked. It was great because of opportunities to learn, co-worker encouragement, co-worker attitudes towards a life-work balance, opportunities for advancement. The organization as a whole offers fantastic benefits and a good compensation package. There were always workshops to attend to add to one's knowledge. Patient safety is highly valued, from what I saw.
Cons
The actual manager of my division was on a strange power trip, and made a lot of decisions that seemed unwise and were totally out of touch with what her subordinates thought. However she didn't work there very long since I think she was eventually let go after I left. CPMC has an integral wellness center, but there are still many unhealthy things about the hospital - the cafeteria food was plain bad and artery clogging, cafeteria cleanliness seemed to be low priority, and the hospital doesn't even do basic recycling or other environmental practices. (Perhaps this has something to do with the unions there?) In the research division, all the studies were pharmaceutical company sponsored, but I wish there were more studies focused less on pharmaceuticals and more on overall treatment and overall patient wellness.