Backstabbing, Political, managers screw you over wherever they can, limit your career advancement. As a result this culture cascades down all the way and everyone is just at each other. There is limited team environment. Some people are lovely but you can only survive if you are a narcissist, good at playing political games, come from an anglo saxon privileged private school background - that is the only way you can be in the "in crowd".
Sad that this is the case as they have some great iconic projects. I have also worked alongside AECOM where I was the Client and very similar "arrogant" attitude.
The only plus sign of working there is the benefits and having the name on your CV.
Benefits - Fruit, Everyday rewards
Backstabbing, awful culture. Long hours and political games.