Pros
It is incredible that Riot has been able to maintain a "start up" feel, despite being as large as it is. Encouraging 1:1s and prioritizing transparency are things that I think Riot brings with it from the early days that are still working.
Cons
The sense of entitlement from some folks is gross. It's great to have access to snacks/meals, swag, events, cool tech equipment, and a beautiful campus - and at times people would complain because their favorite beer was missing from a cooler...or a free piece of swag was a different color than they were expecting. They would complain that their fun team offsite event didn't have an open bar, or that their manager denied a 5 week PTO request after they just got back from a vacation. While these people are smart and passionate, they're also not living up to the "humbitious" quality that Riot hires for.