If you start a shop or work there early on and you take off - it's about the same as any startup - big highs, big lows, big work, impressive product, big impact

If you start a shop or work there early on and you take off - it's about the same as any startup - big highs, big lows, big work, impressive product, big impact, big money. If you work there after it becomes big - it's like working at any game dev shop for EA.