Pros
A large organization that presents opportunity to advance if you take responsibility for your own career direction and proactively look for and apply to internal opportunities. Otherwise, promotion from within based on performance was seldom seen. Benefits package comparatively good. If you live in Pittsburgh, convenience of location. Some employees have access to flextime, work-at-home, and other flexible working arrangements.
Cons
Middle management lacks leadership training; culture of fear and distrust is present in many departments. Employee development/training available, but minimal at best, and not encouraged. When morale dips, very few efforts to address employee dissatisfaction. Employee feedback channels now virtually non-existent; in previous years more opportunities for employee surveys, etc. Some departments ethically challenged---fudging numbers, inflating results, etc. Organization has grown so large that communication and efficiency can get lost.