I also agree it was a game changer. Until Heller under the weight of authority the Second Amendment described a collective right. Heller fixed that.
Then until McDonald, the Second Amendment did not apply to the States (Cruikshank). McDonald fixed that.
So now we have a clear individual right application against both the federal government and the States. Those cases don't, and couldn't, fix everything, and they won't get rid of all gun control, nor stop all future attempts at gun control.
But they provide us with much more powerful judicial tools than we had a few years ago.
"It is long been a principle of ours that one is no more armed because he has possession of a firearm than he is a musician because he owns a piano. There is no point in having a gun if you are not capable of using it skillfully." -- Jeff Cooper