He seems to have an awful attitude for a guy who just made a billion dollars and gets to spend the rest of his life doing exactly what he wants.
That's a fucking great attitude and is -to me at least- much better than "I made minecraft and I'm awesome and the success of Minecraft has nothing to do with luck but is totally all those decisions I made because I'm brilliant" which is the kind of thing we hear from a bunch of other devs.
I kind of wish that mental health support was better and that he'd had some kind of mentoring to help him deal with it.
Perhaps that's a startup idea: support with all the hate and bullshit that comes your way when you're a public figure. More expensive service would include rapid rebuttal service to quash lies and myth.
The pressure of being as much of a public figure as he is, and the person blamed for anything wrong with the most popular computer game in the world, is probably Not Much Fun.
Hopefully he will open source his next big thing so community might be able to keep it alive.