Pros
The company is an amazing place for people of all levels who show initiative and take ownership of their work and careers. Their are no glass ceilings based on degree or experience - it is entirely merit-based, with boundless opportunities for rapid growth. The organization is results oriented; I am evaluated based on what I achieve, but have a great degree of flexibility and autonomy in how I generate results.
Cons
The environment is fast-paced; ERM works on the most challenging projects in the consulting industry as a trusted advisor to major clients. People who want to do the bare minimum to scrape by will be valued for their contribution, but will be disappointed if they expect major increases in salary, bonuses, or responsibility by just doing the minimum. If you want atypical results, you need to distinguish yourself - this is not a place for 'B' players.