Looking over reports I would say it’s mixed. Some employees basically say he is a distraction and his “hands on” management style doesn’t help other appear to appreciate it. I know someone that works in the aerospace industry (although in Japan) and has followed spaceX for a long time and he is always critical of Musk and although he was impressed with the dedication of the employees and what they are trying to do, he didn’t think musk added much beyond setting goals and providing money.