Pros
Lots of opportunities to advance your career exist at the firm. You are definitely put on the fast track at PwC, and get exposure to many many different organizations. Even if you're not a partner candidate, you can still gain a tremendous amount of exposure to various skills and organizations (though I wouldn't vocally express a disinterest in the partnership). Having PwC on your resume is like having a silver plating, and gets you a lot of credibility in the marketplace. The Firm does support it's staff, and appears to have an interest in their well being. There's lots of metrics to manage (particularly at the higher levels) but that could also be seen as a con.
Cons
Don't bother if you have a family or would like to maintain anything resembling a personal life. Depending on which vertical you work for, you can be expected to travel 80%+. Long hours are also very common, expect to work a minimum of 50 hours/week, and an average of 60 hours/week or more. Work/life balance is a joke, the firm runs a lot of internal marketing campaigns that directly contradict their incentives package. Recently the firm has incentivized individualistic competition, so the political game is huge there. Depending on how you play your cards, you are either over utilized or under utilized, there really is no happy medium.