Pros
Great culture, Good place to learn people skills, great benefits, good brand name, Stable job usually, great work-life balance (one of the best you will ever find). A few years here will get you many friends that could be resources for life. Great place for minorities as well. They have an onsite daycare and a good community.
Cons
The work sometimes gets slow as you wait for other departments to give you some deliverable. You could end up with a bad team or a not-so-good manager and that could affect your overall performance, reputation etc. The key is to learn to manage expectations and people (even your superiors). A confident person is seen as a leader and that's what you need to blaze your own path through the company. Many stalwarts work here. You need to identify them and once you work with them, you will be taken up in the organization, provided you have what it takes to perform well.
