I've only seen the preview for the movie Crank, and it looks good. In fact, I think the plot is about as good and simple as you can get in a movie. It is analogous to the TV show "Hot or Not."
In "Hot or Not" people walked on the stage and were labelled either "hot" or "not." Simple. You knew what you were getting just from the title of the show. Production costs (in TV that's big) were minimal. And viewers knew they could watch without any pretense of having to "enjoy the writing."
In Crank, the main character is poisoned, and if he lets his adrenaline flow drop, he will die. So, he gets to pack as much action/explosions/fighting into a 90 minute movie as possible. And you know that going in. The writing doesn't matter, you're going for pure action. I'd bet that any character development you notice in the will detract from your experience.