Pros
Very stable -- been around for a while and know how to do CPG. Work/Life balance is good if you set strong boundaries. Some pretty amazing opportunities -- you are allowed to take on as much as you desire. A few very strong leaders that really care about their people.
Cons
Very large, slow moving bureaucracy. If you're from MN and desire to stay at GMI forever, you are treated well and promotable. If you are an external, no value is given to your previous experience and you will be at the bottom of the pack for promotion, regardless of feedback you receive. They focus on hiring and promotion decisions based on minority status vs performance. This leaves the direct reports carrying the weight w/o the recognition or the pay. Very political and clique-y. I second the comment about The Stepford Wives -- very accurate. Diversity in every aspect except thought/style.