I also felt they killed creativity and intellectual freedom completely. You were not able anymore to work on something else that you'd consider more important because the targets for the bonus were set. I found some fraudulent users who were using our product but instead of doing something about it I decided to just keep in line with what was expected from me after talking about it and having discussions about it with my manager.
So instead of acting on the values and mission of the company, the culture was to chase the money, and you could see it and feel it everywhere.
Worth noticing, at the beginning there were no bonuses but management wanted us to have some 'skin on the game'. I think they blew it by making it such a big percentage.