In his other companies they see him as the public cheerleader who attracts capital and talent, but he's kept away from day to day decisions. At Twitter, he's making ALL the decisions. And it's glorious to behold.
He's been touted as generally brilliant but it looks more and more like he has not only feet of clay but a gold pin in his belly button.
The only engineering we have evidence of is that he's a self-taught programmer, which is fine, many good programmers are self-taught. But this doesn't make you an "engineer" in general. Also the people who fired him from PayPal were appalled by the quality of the code they found, so despite he could code, we have no evidence he was actually good at it.
Surprise, surprise --- autism is not all that compatible with social media/advertising/Twitter.
His main talent is being a taskmaster and driving technical people hard.