An objective assessment of Musk's batting average requires considering the big ideas that flop, never materialize, or fall far short of what was promised. Once you do that, Twitter seems like it could go either way from here. That's not even considering how split his attention must be at this point.
On the other hand, with that amount of wealth, the average intelligent person probably feels that they could do better, and I'm not sure they'd be completely wrong.
SpaceX delivers boost to orbit at a cost that beats every other major player.
Clearly, he's done nothing. /rolls-eyes