I think Mr. Dunn has lost the point about Night of the Comet. NOTC doesnt take itself seriously, it doesnt need too. It has presented a modern day take of all those B movies from the 50's with over the top monsters / villians / leads.
The two leads are superb in their roles, they seem to relish they are playing a couple of airheads, and act the part accordingly. How can you not love a Mac 10 toting cheerleader who is more concerned with the country music playing in the car, than the zombies about to mutilate her outside.
If the movie had taken a more serious note, this film wouldnt have been so much fun to watch, to see the zero budget special effects, to listen to the cheesy 80's songs, and as for the end, yes it all kind of neatly plays out, but sometimes you dont need a severed head in a box to make a film work. Plus isnt it nice to know that DMK was one of the survivors too.
Enjoy the film folks, since although it may not be 28 days later, it works just fine.