Pros
They have a knack for hiring some of the best people I've ever had the pleasure of working with. Also having access to educational resources from Publicis is a great thing to have.
Cons
They have no concept of communicating to their employees things they should know. In a short span of 7 months I saw two rounds of layoffs occur, both having my director and two supervisors overseeing my work be let go without informing me, my adjacent team or any of our clients. In addition, it was expected to take up additional work to make up for this. Despite being willing to do so, they would not even consider an increase in pay or a promotion. I've had to work extensive hours to make deadlines set up by the very people who would not communicate with me whether my job was in jeopardy or not. It doesn't help when a VP is doing the same job for an entirely separate Publicis agencies at the same time and never has time to deal with internal issues or communicate in a timely manner.