Pros

Opportunity to learn about the dynamics of large company operations.
Contact with big-name clients although 90% of that time will be with Microsoft (of course).
Competitive compensation packages for mid to senior roles.

Cons

No work life balance. Expect to work 60-70 hours a week (yes I am serious, that is not a typo) on a regular basis without overtime pay.
Fairly common to find incompetent managers at all levels who gain positions through favors and politics rather than by experience or competency. Ivory-tower mentality of management, that speaks loudly but takes action very slowly and with poor planning.
PR applied to its own employees beyond reason.
Very few opportunities for advancement if you are not a management "pet".
Little to no diversity of thought is allowed (or more specifically innovation is talked about constantly but the end result is more often lots of the same as before).
Extremely limited cultural diversity throughout-even for the region.
Boring offices best termed "call-center" layout depending on region.
Collaboration is virtually nonexistent throughout teams, often due to everyone being completely over-worked.
More of an also-ran agency compared to leading companies in the same space.
Extremely high turnover rate, expect to see up to 50% of your team leave every year. This tends to create an "old veteran" mentality for those that are able to tough it out which then creates specific cliques of "survivors". In other words...why bother getting to know someone if they are likely to not be there in a few months?

Advice to Senior Management

Be more connected to "the little people" that execute the large percentage of work accomplished on the ground. Be more open minded to diverse backgrounds of education and professional experience. Demonstrate through action and less "fluff" talk.