Pros
The company has a big reputation in the market, so the experience that you get to add in your resume is valuable. Also this is a huge organization, so if you are lucky you get good projects. Managers are generally professional and the atmosphere in the organization is also very professional.. however there are exceptions specially in India. If you wish to join Accenture then you should come in with a mind frame of being here for long term as you start getting more visibility only after you have completed at least one and half years, so you have to be patient.
Cons
There are too many teams for doing the same job.. maybe it adds redundancy to the organization, however you start feeling that you do not have any work to do.. and lot of days you might be just sitting idle. In this market scenario it also triggers the fear that you might lose your job. Also they have been firing the bottom 5% of people from the projects based on so called performance..However the reality is that they have a target number and whether you clear the Performance Improvement Program or not you will be fired. Also not many good opportunities for MBA's who are not from the top ranking B-Schools