Pros
Merck is a company transforming and shedding some bad habits. Sr Mgt is a mixed bag but there's hope for the future as more difficult decisions are made today than in the past and there's greater honesty about performance. Challenge is executive ranks holding themselves accountable. Terrific talent at most levels and compelling mission. You can be cynical about profit margins but you really are part of an organization that is driving improvements in human health. Govt won't be bringing these medicines to the people.
Cons
Greatest downside at Merck is the red tape which thankfully is lessening. There's a greater sense of urgency to get things accomplished. Performance mgt is still uneven and that can translate into lack of satisfaction. You just have to be realistic. It's a large org and has all that you'd expect as a result.