Cut throat and toxic work culture. They work you to death, very poor work life balance (or just very bad management with unrealistic expectations?!?).
If you are at a junior level, you will be used as a tool and not appreciated. They will push all the work to you while your seniors get all the credit.
'Nice' colleagues are not what they seem...too political, selfish, and gossip is rampant.
No chance for promotion at junior levels unless you can prove yourself to senior management or have a boss that really supports your growth. Better to join as a director level as you get more exposure, even then there is no guarantee that you will do well due to the politicking. Yikes!