Pros
I have been working as a costumer support for Arvato Bertelsmann for the past year and a half. This job is good for people who look for stability and support while they are dealing with immigration or new city environment (as most people in Berlin). After 1 year it starts to get to your bones. The bosses are generally friendly, holidays are flexible and the money is ok (just ok) to start with.
Cons
Not a happy environment, sometimes you feel like just a number or a part in the machine. Not a clean place, The money can be way better, the management is bad and doesn't care about you at all, I have been moving from place to place 5 (!) times, office to office because they had problems with the space (brought more and more people in). They tell you it is a multi cultural environment but most people just stick to themselves, not a friendly place to meet people. For a company that its number 5 of the biggest companies in Germany I would expect much more then that.