Pros
The people, Mercer really does hire some of the best and brightest Location, they have offices worldwide, if you are able to travel with your position you can utilize other offices Large number of positions should you want to explore other lines of business If you depart with the company and return years later you come back to your same seniority and benefits
Kontras
Terrible leadership, constantly changing which means vision and strategy is never fully developed or deployedTyp Terrible at keeping the talented candidates they hire due to low salaries, minimal promotions, no talent development and managers literally blocking employees from getting other positions. When they do promote it is often someone who doesn't do much but has been around awhile because they have lost all the other talented employees but want to pretend they promote from within, really this is just promoting more puppets to keep with the status qua. Benefits aren't great for being an HR consulting firm, you would think they would know what they're doing but I had better benefits at a nonprofit, seriously. Left hand is never talking to the right hand, so a lot of double work, waste of money and "do now ask for forgiveness later" approach to business.