Pros
Got my foot in the door working in online games production. Some of the employees are pretty cool, but a lot of "lifers". The company was trying to go through a "Western Renaissance" while I was there, focusing on developing western games and exporting back to asia. Doesn't seem to have worked out, last I heard the parent company (HQ in JP) is reappointing more Korean leadership. They've been down that road before... With the products they're pushing and the developers they have falling apart, I don't see a lot of growth potential for the company. This was strictly the PC division in El Segundo, btw. Can't speak to the Emeryville mobile location.
Cons
On a personal level,they rarely seem to promote from within. The structure felt too hierarchical and political for a normal worker to rise. Once you realize that those HR performance review things are a load of BS, you'll start looking elsewhere.