They do not have a very good back office system, their whole policy issuance and premium tracking system is frankensteined together from old pieces of other systems. A lot of things are built manually in spreadsheets and word documents and uploaded. None of the systems talk to each other, so you have to reach out to people constantly to see what the policy status is.
Also, you get a lot of negativity from top management, a lot of "how did you fail AIG this year, and what will you do to make us better next year". Honestly it feels very toxic. It is fine for a stepping stone and to learn about the business and regulations in different countries and so on, but I would find it depressing to spend more than a few years there.