This move is simply rubbish, I myself have seen the entire anime and at points during the movie I found myself lost as to what was going on. The plot is also jumpy and I think it would take someone about 10 goes at watching it just to get the idea of what was going on.
It also cuts HUGE chunks of the plot out, including several key characters and then adds ones that don't even exist to begin with! I mean.. where were Near and Mello? And what about when the business men were Kira? Oh and Light being chained to L for a substantial part of the anime? These are just a few examples I can think of.
I loved the anime, I hoped that this film would be as good, however I just found it a huge disappointment and nearly turned it off half the way through. If you want my summary... don't bother wasting 2 hours of your life on this film, go do the dishes.. hoover the floor or even watch paint dry. All of these will be more exciting than this film.