Ventajas
Riot's provided a great opportunity to work alongside a group of geniuses on a daily basis. Simply put, the company doesn't hire dumb people. Being able to consistently count on teammates for quality work and support is an incredible asset. Beyond that, the company is clearly on the bleeding edge of the industry and is just getting started. It's an incredible place to learn and grow. Benefits are very generous as well.
Desventajas
Work/life balance will almost certainly tilt in favor of work. Riot is a hard-driving firm that offers great opportunities to those that chase them down. If I had a family, I'd worry about this more, but as a bachelor it's not so bad. That said, my leisure reading and watching time has dramatically declined.