Pros
They pay relatively well if you are able to see past the literal mountains of crap that you are subjected to on a daily basis. They have a slide!...yay? They have a fully stocked bar that employees can use/abuse to forget...oops it was only stocked the opening week of the new office... You do feel comfortable doing mediocre work that doesn't challenge you or require much thought.
Cons
Imagine getting a degree in Design and Advertising, and then being told buy 20-23 year old Communication majors to move headlines 5 pixels to the right and then 5 pixels to the left the next round. You are now at Scoppechio. Most of the management team is either so far burring up the CEO's nethers, or they are beyond defeated and have given up trying to change things. It's all about the boat, right? Well this boat is sinking, and you are franticly trying to bail water. All while the CEO screams curse words at you for not executing his own creative concepts. If you are a designer/art director- You are the bottom of the totem pole. You work for (not with) the account team...and the 'strategy' team...and the CEO...and anyone else that wants to throw their opinion your way. You will never be respected. If you are in account service- You are wasting your time learning how to always say yes to the client instead of learning when to push back and be respected. You are glorified 'yes-men'. If you are 'strategy'- You have the best job of all. Just Google a bunch of things and spit it out into an unintelligible 3-page 'brief'. Hoorah All-in-all it is just a bunch of production work that will suck your soul out and leave you hating your life. Stay away.