Pros
Location. Decor. Young people. Lunch. Lots of lunches, actually. Oh, and on the client's dime. I hope DH clients read this stuff because YOU'RE BEING FLEECED! It's 2015. Who doesn't make responsive websites by default? Oh, marketing firms that make more money off of making two distinctly different websites with completely different code, that's who. It's called a page break, creeps. Oh yeah, awesome company. Dignity? Optional.
Cons
Complete and utter waste of valuable human capital. At the center of Philadelphia, in the coolest building in town, you'll find the most wasteful organization on the planet. Intentional diffusion of responsibility at the sake of million dollar client pocketbooks. Entire fire drills on how to find blame on behalf of the client! Meanwhile, forcing "junior" employees to problem solve, sometimes resulting in 4 pay grades and 10 people around a table for round 1 copy edits. Unbelievable. No, you would not believe it. The talent is extraordinary, and extraordinarily abused and misused.