Avantages
It's one of the Big-4, therefore you can get a strong project portfolio, learn the internal culture of the Fortune-500 companies and overall industry landscape very quickly. Such experience does open many doors.
Inconvénients
The company just keeps going downhill, and good people have left or are about to leave. BE will be in red at least another year, and likely longer. The utilization metrics drive the overall employment status and process; even if you get on decent project, there is no brand support to your work. Resource realization is poor; senior roles run at 1/3 of the listed hourly rate, and the projects more and more are staff augmentation, with undefined scope and no added value. The remaining leadership is biased and subjective; overall morale is low.