Avantages
Good salary. Good many days off (especially in the Netherlands, France or Germany). Used to have a good training budget but times are definitly changing. Promotions rely to much on who you know and not always on your actual achievments but thats probably true for a lot of large companies. You do have good ways to develop yourself if you want to. Diversity is handled well by the company but the intregrity does not translate to true respect for the emplyees.
Inconvénients
I worked in IT which was constantly on the move with not really much vision behind it. They (IT) sometimes act like they can be the next Google or Apple but it's a different kind of organization altogether. The organization changes direction every couple of year..current trend: fire their current workforce and hire cheaper employees in Eastern Europe.