Pros
Depending on who you work for, there are some really great managers and the company is filled with very intelligent people with plenty of opportunities to learn.
Cons
It used to be a great company, yes times have been bad for most companies and FTI was not immune to this although for a good majority of the time they were still performing well. The problem is that nothing was ever invested in the corporate functions of the company and/or money was put into the wrong programs and areas. There is no culture, which isn't entirely an issue but don't expect to feel like you belong to anything outside of your group. They are feeling the pain now as many of the good employees have been leaving over the past year. There is a lot of talk about how much senior management cares and wants to invest in the employees, but its a lot of lip service. There are other consulting firms of similar size that are much better in terms of corporate culture, opportunities for advancement, etc.