Pros
Great campus, and highly competitive salary and benefits. You will like be paid the most here than any other studio in the games industry.
Kontras
If you are unfortunate enough to work on League, be prepared to work with some of the worst tools in the industry. This is coupled with a non-communicative engineering team for both tools and engine, and an incredibly condescending set of people who will talk down to anybody who is not an engineers and treat them as big old 'dumb dumbs'. Artists and designers have to constantly work around some of the shoddiest tools in the industry, that are made in isolation and never really signed off or are given the chance to actually have input during their creation phase. It's incredibly ironic and hypocritical to see principal engineers at Riot give talks about being 10x engineers and how communication and empathy are so important to being a good engineer, and not see any of that from their own teams.