This is one of the best movie series left so far today. Not because its expertly written (it isn't) or because of its great music score (average at best), but because it knows what it is and doesn't pretend to not be. Fast cars. Good special effects for the scenes. Famous actors to headline and say dumb lines. Hip hop and rock music. Half naked women at some point.
Either you like the bad acting (which we all know is intentional on at least some of the parts, if not all of them) and car races/crashes with outrageous "missions" or you don't.