Pros
Bridgewater Associates is one of the largest hedge funds in the world. The people are extremely intelligent and very talented at what they do. I highly recommend this job for students coming out of college as you'll learn a lot about yourself. If you've got thick skin and a good sense of self-reflection, you'll get a lot out of working at the company, regardless of what you do.
Cons
Large disparity between high end roles (IA's, MA's, TA's) and other roles throughout the company. The technology at the company is rather poor, so lots of frustrations there. The review process is often focused on negatives and there is a bias towards giving poorer grades to appear "tougher." Some of the smart and capable people you meet are egotistical and come across as jerks.