I would have Loved this movie had he after killing all the people in the car, he gets out gets killed by a monster and thn give a view of the world that has been taken over by the mist. The ending they used was a great punch in the gut. And as Doc said it showed balls. But the only point to it was to punch you in the gut. I would have prefered a movie about the end of the world as opposed to a film about the end of a man's whole life.
End Spoilers
I also did not like everyone jumping on the crazy religion band wagon so quickly. I am a tad tired of MONSTERS are Bad but People are worse thing.
But overall everthing was done well. Scatch that. There was some really poor CGI in this film.