Why isn't Dwayne Johnson a big star by now? The camera loves him. He's funny, self-deprecating and takes the occasional quirky chance with an off-the-mainstream-reservation experiment like the someday-to-be-released Southland Tales.
Maybe having to carry around "The Rock" as an alias or alter ego - or whatever it's supposed to be - weighs down his upward mobility. Maybe he's not stoic enough to be an action guy or too brawny to be taken seriously as a comic actor. It could be that he hasn't quite found the right vehicle to drive home his persona.