Pros
Definitely, their mission. There are some very friendly, laid back, smart, funny, hard working people there (but unfortunately they're few and far between). Also the common area of the office building (Zynga's HQ) has a nice cafe, couches, and lots of light - makes for a nice alternative work/meeting space.
Cons
In my experience, there have been 3 major cons: 1) Management - those in senior leadership positions are truly inept at managing. They drag their feet on any and all decisions. Transparency is non-existent. Time after time, they prove they do not value efficient processes or quality of work. Overall, seem to thrive on chaos and drama. Cliquey, not collaborative or empowering in the least (unless you're on their elite favorites list). 2) Culture: Very judgmental based on where you went to school, your hometown, your personality type. They love putting people in a box. Really weird and very disappointing. Had high hopes, but the culture just sucks the motivation and energy out of the work. 100% agree with previous reviewer: "Lots of complaining about others behind their backs and going around people to get things done "their" way. There's a culture of insider politics and bullying." 3) Work environment: The office space itself feels like a depressing dentist's office. From the 80s. High walled cubes mirror the non-collaborative culture. The huge lack of meeting space is constantly frustrating and bogs down work. There are only a handful of rooms to share amongst 100 people. It's the norm to be fighting for rooms and wasting time searching for a place to have a simple phone call. Hard to believe it's surrounded by some of the most creative, cutting-edge startups on the planet - the office space has got to be the most outdated, uninspired office in San Francisco. Overall, If you're fine with arrogant personalities, don't care about efficiency or collaboration (and certainly not creativity or innovation), and like a severe lack of decision-making and transparency (and a lot of high school-esque drama), this is your place. Otherwise, unfortunately, I would recommend you invest your time elsewhere.