Pros
Its a large company and there is a vast amount of projects and work to be done. There are some great people that work there, and the knowelege that can be spread is a big asset to McKesson. Because the company is spread out across the counrty it make for a enjoyable way to meet people from all over.
Cons
McKesson's biggest downside is the way it treats employees. From the lack of support from HR to the confusion of a very top heavy management structure, its hard to get any work done, because the priority changes constantly. The oursourced HR model that McKesson uses ensures that you are treated as a number, not as an employee. There are very few opportunites to grow within the company and McKesson version of career advacenment is missing the mark.