Pros
I met some of the best people at the Ad Council and have formed strong lifelong friendships. Some of the work is interesting and it is cool to be able to work on different campaigns and projects. As a Campaign Manager, I was exposed to all facets of the Advertising industry (PR, strategy, analytics etc.) and got to meet a lot of external people like clients, creative agencies etc. It's a great place to start at and gain exposure and learn a lot from.
Cons
They always talk about work life balance but that actually is not the case. The hours are really long and everyone on the team seems very swamped so there's no one really you can ask for help from. They also always promote how diverse the company is and how forward their DEI initiatives are, but it's actually quite far behind with a very white senior team. I also don't think they are the most creative place with the most innovative ideas..it seems like they tend to follow a lot of what other people/companies are doing.