Pros
....honestly cannot think of a pro. They attempted to have something they called "Day for Meaning", which consisted of leadership pontificating at employees for an entire half day, while everyone tried to complete their work covertly.
Cons
No training at all in account. Nothing is written down, they expect you to know everything the minute you arrive and it will be help against you if you do not. Don't expect ANY empathy at McCann, during my time there my boss never once spoke a kind word to me, or treated me like a person, instead you are treated like a workhorse, told to sit down shut up and do your work. Don't expect HR or leadership to check-in either. HR will not even check-in to see how your onboarding went or how your are doing. Don't expect mentorship or career growth, no matter what lies they tell you in the interview. McCann Managed Markets prefers to leave great employees in the same title and salary for years, before they would consider promoting them. It's less about merit and more about saving them money.