Prior to about 2010, I think the figure is accurate. They did the best given the knowledge and equipment given to them. I'm not making this political btw, it's simply post the crash.
Post 2010, we've have had to reduce the deficit at a time where medicine is exponentially increasing in complexity and is at the mercy of private drug companies investing a huge amount in R&D to keep ahead of the game.
If we are ever to actually Brexit, then I really hope we put all our skills in AI, medical machinery and drug development.
These three things are going to be huge moving forwards and if the NHS is to survive, then we need drug development and medical machinery to be at the forefront of our national business.
The NHS has never been perfect, but MRSA is harshnto blame on them as it was an unknown disease until diagnosed and was dealt with as best they could.
Surgical errors will always be made, whether NHS or private. I guess you could sue for more if done privately? (The suing culture has a lot to answer for too btw)
The rest of what your post implies is down to either mismanagement, lack of education or lack of funds.
Waiting times in A&E are down to a lack of doctors, lack of GPs and/or a lack of education. For example, If you have some sort of rash that looks like it could be meningitis, you'd ring your GP, they'd say they can't see you till 3 weeks on Wednesday. At that point, you'd ring NHS direct; they'd talk it through with you and advise you to go to A&E as they can't take the risk of you dying following your phone call.
GPs are retiring as soon as they can as they've had too much legal responsibility put on them. They can only refer people to the next level of specialist. That could take months/years. If they misdiagnose then they are culprable. They also need to invest heavily in their practice to make it sustainable.
Crazy times we are living in.