Correct me if I'm wrong, but I believe that legislation which McCain famously gave the thumbs down was long on ACA repeal/defunding provisions and short on details of what would replace it. Like many GOP politicians, Trump had severe problems even trying to articulate what his/the GOP's health care plan actually WAS.
As for the ACA, people could quite reasonably debate whether the ACA spends too much public money on health care. (It spends a lot, because health care has gotten expensive, and if you want to expand health care to include people who are not wealthy or who do not have employer sponsored health care benefits (plenty of working people do not get health care benefits), it is going to be a drain on the public fisc.
But with respect to things like the ACA ban on denials of health care coverage to people with "pre-existing conditions" or the ACA health care mandate (which was necessary if you are going to have viable health care insurance pools, and want to ensure that a broader cross section of the public has health care coverage), those provisions are wildly popular.
I'm a liberal, but I'm not necessarily ready to argue that health care is a right. Particularly not with respect to things like experimental or highly expensive, cutting edge healthcare. I believe that we could help keep a bit of a lid on health care costs if we had legislation that imposed some form of healthcare rationing. Basic preventative care (regular checkups, prenatal care, basic surgical procedures) could be covered, and other procedures not covered. That is a brutal choice to make when you are confronted with someone who needs cutting edge but very expensive life saving treatment he or she cannot afford. But we're talking about a health care policy that serves the American public as a whole, not just relatively few unfortunate individuals. As things stand, we are rationing health care by forcing people who cannot afford health insurance to go to hospital emergency rooms for treatment. Waits in emergency rooms are, to say the least, long. And that is a place where long waits are just what you DON'T want. Good luck getting emergency care if you need it, regardless of your means.
Finally, Trump has lately been ballyhooing that he has cut the cost of prescription drugs significantly, and immediately. I do not know the details, but his reference to "immediately" suggests that he signed some kind of EO on the subject. Time will tell as to whether Trump accomplishes much in this area but, if he does, he will deserve some credit for it.