Pros
Great for personal development and role development. Worked with a lot of people who are energetic and passionate about what they do. Mars touts their 5 principles and sometimes follows them. Work life balance is important, but can lead to lackadaisical attitude toward project completion.
Cons
There is a push to always be positive, although your thoughts are "always welcome". This includes an annual focus on Gallup engagement survey. Although encouraged to express your opinion you must make sure to be a team player as it is ambiguous as to how this will affect your position and team in the big picture. Mars tends to make major restructures called "revitalizations" about every other year and due to the fact that the company must maintain the view of non-discrimination, they'll separate with anyone regardless of performance. Goals are strictly bottom line to the corporate OGSM and they will sacrifice success at field level and the financial betterment of the field sales team to ensure that the corporate leadership makes it bonus. Be prepared to work for your salary and not much more. Took sales driven brands and made them marketing driven brands to great detriment of wonderful brands. Most of the marketing personnel were barely out of grad school with little real world experience and made changes to the brands without understanding the market, industry, and legacy of the brands themselves which led to huge declines in brand awareness, customer satisfaction, and retail sell through. They created confusing messaging and instead of becoming the leader of the industry as they could have, they became the "safe" brand which follows the leader many months/years behind innovation and continues to lose share.