Management will lie to get you to do what they want. This comes from the top down.
Some of the decisions are often personal, if you are liked and part of the 'in' crowd you are much more likely to succeed. If not, you will be shown the door.
KPIs and targets are unrealistic - this doesn't mean nobody hits them, but it takes 6 months (minimum) to learn the job and even then it isn't a given that you will sell. Only 1 in 10 sales people actually hits their yearly targets.
The products are poor. They do not have Product Managers so feedback falls on death ears. Since this won't change you will always be selling second rate products so sometimes there is really nothing you can do to make the sale.
The brand is poor and prospects are wise to this.