Pros
I worked in the Technolgy services end of Accenture which basically provides infrastructure and technical support to their consulting divisions. The best reason to work for Accenture is its reputation- I actually didnt know how well they were respected in the industry at the time but if you leave them having Accenture on your CV is a great door opener. Other than that the best thing about Accenture is the fac tthat they have everything pretty much covered- unless you reach a senior management postion then almost any problem you have they have a solution for.
Cons
Its very regimented- they have a standard operating procedure for pretty much everything, which, from an organisational point of view is excellent, but if you're looking for a place to share idea's and innovate then its not so good as you're job (if you're low level) is pretty much mapped out for you and deviation from that map isnt encouraged or noticed. (might be a good/bad thing depending on your own personality)