Pros
Supposedly Moody's is designed to give people in the financial field a chance to do some meaningful financial analysis in rating the riskiness of debt and other securities.
Cons
Employees treated like disposable parts. Often times, the hiring process seems to be completely random. I had excellent grades from a top undergraduate business school. No one wanted to interview me for a full time job. The management is very disrespectful to lower ranking employees. Very hierarchical. It is the McDonald's of financial services firms: they have a franchise (i.e. the ratings, which often are required); they have their standard models, and they hire randomly people that can plug in numbers into their models. The mortgage crisis has pulled the tide out on Moody's, and showed that Moody's too, was swimming naked. They are all about the cash, no integrity - in the way that they treat people and in the way that they rate securities. Moody's is probably a good business, it generates a lot of cash flow, but in my experience, that definitely doesn't translate into a good place to work - it's a lousy place to work.