I just watched Steli Efti's TEDx talk on happiness as an entrepreneur.
It's a great presentation: moving, emotional and with a great message.
However, if you look only at the technical aspects of his talk, it should have been quite mediocre. He didn't use any slides, he walked around all the time, he had to hold his own microphone. All stuff that we're told is bad for a presentation. But still, it was really good to look at and go with it.
Why? Because Mr Efti has a message that he cares about. And that is the only thing that can make a good presentation.