Why all Fantastic Four movies fail

It's very simple: the idea of Reed Richards is just completely alien to most of the people who can greenlight something in Hollywood. A renegade science genius so smart and crazy that he'd steal a spaceship and ask his girlfriend and her kid brother to be his co-pilots, but is still a dedicated husband and father who just loves to explore and occasionally saves the world? I mean, the guy named himself "Mr. Fantastic". 

He's not motivated by greed or lust or ego, but curiosity and joy of finding new things. They can't handle it. They don't even understand it. It's the same reason why Mark Zuckerberg is allegedly driven by rejection in The Social Network. 

So they make him an awkward geek or a nerdy kid because the notion of  a good, smart, honest, loving man seems devoid of drama. These movies fail because they don't accept the basic premise of the book. It's an adventure story, like a Scifi Indiana Jones. Marvel studios would get it right. But until Fox or whomever else holds the rights accepts the central conceit, these movies will always bomb.