Pros
Adecco is a market leader and a global corporation. As such we have excellent bargaining power and tend to get top clients. When the market is unstable (such as now) we tend to still do quite well. Other employees in Boutique Agencies might get paid more but their future is more unstable. Progression opportunities are also excellent. The Adecco group is made up of several large "Sister" companies - if there are no opportunities in your area, you can easily transfer your skills to another company within the group. The Christmas parties are also brilliant!!
Kontras
As with lots of larger companies communication from Senior Management to Middle management is very poor. Our working hours were decreased recently (which is great!) but we were all told via an email to the whole company - My boss would have liked to have been told before, so that he could plan our business better and prepare us for the news. Middle managers are often people that have proved themselves to be good sales people but this doesn't mean that they are good managers. They are often rewarded for doing a good sales job by being promoted and being given their own team, without proving first that they know how to manage the team.