Who did he took over SpaceX from?

Glad that you had to dig that deep to find something wrong. But: SpaceX was taken over from NASA/DoD (~ TRW). People generally don't say that because the people actually involved feel that it was NASA that abandoned them/their ambitions rather than the other way around.

But you know the same story emerges as elsewhere. Mr. Musk's was a financier, nothing else.