Pros
KP has improved its reputation clinically speaking compared to the 80's "I don't want Kaiser...I want to live" reputation. A lot of the people who work here seem grateful to just have a job ("working retired", "poorly educated", etc.) when they would otherwise be working service industry or retail. If benefits matter to you more than a competitive salary (you are a secondary earner in your household), then I can see how KP would appeal to some people because they are gold plated. Admittedly, there are a lot of plum jobs for people who get into middle management "non-contributor" positions, but I would not count on that remaining for much longer. Pension for those who stay past 5 years. Once again, a lot is going to have to change around here shortly because of competitive pressure kicking in. It already has begun.
Cons
This is the most appalling run organization of its size in the world. Seriously, I think large parts of the federal government are better run than this house of cards/rubbish dump. Organizations rot from the head, and Kaiser Permanente suffers from this acutely. The "leadership" is absolutely terrible and completely out of their league when they are not just being flat out corrupt, nepotism, blatantly political, etc.. This trickles down to middle management which is very insecure, does not listen to their employees about staffing or resource concerns, and then acts very hands off until something big breaks and they start knifing people in the back out of contempt. Due to many of the rash decisions being made currently, the last good people with a few neurons to rub together are resigning, changing industries altogether, or taking early retirement. The core IT systems are a completely balkanized joke and show decades of mismanagement and neglect which could be enough to sink the organization by itself in this new day and age. Doctors and clinical folks have way too much say in corporate where they frequently know nothing. The HR organization appears to have been co-opted by union/diversity agenda people who help contribute to the equal opportunity, egalitarian, let mediocrity reign/"let's hire the least qualified/cheapest person we can possibly find who might have a prayer of holding down this job" heck hole of a work gulag full of demotivating incompetents that is KP.