The forced bell curve for performance review really stifles the feedback process and can sometimes demotivate people. This can be great if you are working with peers in your group but can difficult if the range of talent is broad. For example, if you are in a group with several senior members and you are the only junior member, by default your performance review will almost always be on the low. Your performance is never just graded by itself but rather compared to others.
Like most companies, there are a lot of politics involved in getting a promotion or moving ahead. This isn't just special to CIGNA.
When there were layoffs, CIGNA could have been more transparent with the process. It led to a lot of rumors and fears among the employees. Again, I don't think this is specific to CIGNA in this economy where layoffs have been occuring at many companies.