There is hardly any true strategy work (Less than 20%), mostly its operations consulting, where any average management professional can get the job done - so what makes the difference between success and failure is politics and knowing the right partners - suck it up.
Be prepared to spend 70% of your time in making changed to the presentation deck based on personal taste of every partner/ sr. manager/ director involved in the project. The time spend on analysis and developing a solution is hardly 20-30% of the whole time - rest is politics management, validation and meaningless changed to slides. BTW: the firm still does not have a standard presentation format.
The firm is careless in hiring more than needed staff in good times and panicking and firing significant chunks during bad times. People are let go off - without merit analysis - its mainly politics (for above average performers). There is no single culture or intellectual level - IT side of things makes a lot of money for the company. however their mindset is completely different from Strategy & operations consulting people - that creates a lot of conflict.