I know of one person suing them for a substantial amount of money because of incompetence.
My neighbours husband died in there but before that happened he was in for about 4 months and they just sort of 'forgot' about him. He was sort of cared for but it was minimal if you know what I mean.
http://www.bbc.co.uk/news/uk-england-hampshire-41022259
My own experience with QA has been hit and miss with one consultant giving me the number for a private shrink as he thought my fears that the operations I had were not working as they should were all in my mind.... Turns out I was absolutely right and he just didn't want to believe he had done anything wrong.
There comes a point I think when these 'super hospitals' become too big and can't be managed effectively.