Pros
Pfizer is great company with over 165 years of experience in the healthcare industry! Its first-class products and ground-breaking therapies set the tone in the pharmaceutical industry! First in-class products tend to be the standard with Pfizer and they create markets and change the physician treatment paradigms by providing them with dialogue to better engage their patients. Their disease-management programs and community outreach are second-to-none. Pfizer's philanthropy is also tops in the industry! They give more money to charities and donate more medicines to third-world countries than any other! That is by far, one of their top corporate mantras!
Cons
The continual acquisition of companies over the last 15 years has watered down the core Pfizer culture. The "If we can't beat them, we'll buy them" approach upsets the corporate culture each time there is an integration of upper-level, mid-management and field forces from other companies creates a mixed bag of parts. It takes awhile to get a sense of normalcy, then as soon as things calm down, Pfizer acquires another company! It can be quite disconcerting, but it is obviously necessary to keep the company profitable and the shareholders happy.