Pros
Great opportunities are available if the right people have your back and if you are willing to give up your life to work for them. Big 4 on your resume increases career opportunities.
Cons
Very passive-aggressive environment. Terrible communication from senior managers and partners. Reviews are based on the opinion of one or two senior managers & partners rather than your documented reviews. Ratings are pushed down to save money on raises. Terrible work hours, no work-life balance. Your success is very dependent on you knowing the right people. They reward people who complain constantly rather than hard work. Employees are treated as if they are disposable. Many superiors would rather do the work themselves than teach, and then turn around and give poor reviews. You are rated against peers across the US, when opportunities are not the same. Different areas have different clients, different offices rate differently, etc. Competition across employees is encouraged, and the teamwork aspect of audit teams is not emphasized or encouraged.