Pros
The interview process at Riot is long and hard (yes this turns into a pro). The recruiter who handled my case was honest about this from the outset, extremely responsive and kept me in the loop. However even with all this it was at times frustrating, BUT within 24 hours of starting my first day it became obvious why the hiring process is what it is. Sure it's about finding the best talent, but it's equally about making sure that everyone hired fits the company culture? So what is culture, is it 'we all like to joke around and have fun whilst we work'? No, it's the core values that Riot has - that our players are our first concern, that we need to do our best for them at all times, that we need to always be improving. Being in an environment where everyone shares the same values as I do is incredible. I'm now encouraged to follow my instincts, to push the envelope, to make mistakes, try new things, to unlock my imagination and drive any project I believe will bring our players benefit. There's also loads of perks - Gym subsidy, international travel, free lunches, game funds just to name a few!
Cons
I honestly can't think of any cons involved in working at Riot. I haven't been with the company very long, and I'm still very much in the honeymoon phase which doesn't show any sign of wearing off.