Pros
As a privately-held company, Cargill usually does not react without good thought to market pressures. Projects are given time to succeed. Culture is important to the organization. Cargill picks employees that fit into their culture - so you feel like a part of the team right away. There are so may different business units, there are many ways to learn and move around the organization (usually laterally). If you like to learn, you'll never stop learning at Cargill. No one person ever knows everything. CEO Greg Page is one of the brightest CEOs in the US today. In fact, Cargill is filled with incredibly smart people.
Cons
The company is decades behind in technology implementations and in the policies surrounding it. No access to personal email or social media like Twitter or YouTube. If you are trying to learn how to do something, and there is a video on YouTube, you need to find it at home. If you want to follow industry leaders and organizations on Twitter, do it at home. Leaders are primarily 50-something white men. Very few women in top leadership and few people of color as well. Cargill is struggling with an SAP implementation and allowing Accenture to drive their business decisions.