+ Truly global firm: I have worked in 8 countries since I joined McKinsey. Client impact is infinitely more important than locally optimizing and billing hours (like some consulting firms do)

+ Unparalleled depth of expertise: I was McKinsey's client once and now as a Partner, I see the same level of deep expertise that goes beyond a large dump of powerpoint pages. Numerous instances when I needed expertise in a highly niche area but was surprised that someone in the vast network of McKinsey turned out to be a credible expert who's actually done it

- The size and scale of the firm is daunting. So for a new person, it takes some time to understand that. It's an art to seek help because it's available. That art cannot be taught so new joiners need to spend the time and effort mastering it