He doesn't have to be 'outstanding' or even 'great' to have an enormous impact on the world.
There are books where you can learn physics and math, and while they aren't free but neither is the computer you need to look at his videos...
Computers and internet connections reach places on the planet where very few physics books go, and embody potentially every book ever written + all the free content available out there.
Some professors are able to teach you complex things in such simple terms that it damn well blows you away. I remember being tought van der walls equation's proof using some very basic concepts and the taylor series. I can't find that simple a proof on wikipedia now, and unfortunately I have forgotten much of physics. SICP is also a good example of a good teacher making complex problems simple.
I don't want to disrespect the effort he's going through setting up all the online content, that's clearly something very useful to those that don't have access to real people to learn with. But to hold him up as as especially awesome and unique seems to ignore the thousands of equally awesome teachers that are out there teaching like that every day.