I can't help much, but I will try. I only have experience with one HCA hospital, during clinical. It was by far my least favorite clinical site. The rooms were tiny, hospital floor was disorganized, and hated the computer system that they used. A lot of the nurses on the floor were agency or PRN there and worked full time for another hospital.
I would only take this with a grain of salt since, as I said, this was my clinical experience and actually working there may be completely different.
I believe if you google HCAmidwest, you will find a report on the job satisfaction of nurses at HCA facilities. The report is not pretty unfortunately
Hope this helps and good luck to you,
TL