Iiii respectfully disagree. The rescuers showing up JUST AS the protagonist has collapsed into utter despair? That's an overinflated sense of dramatic irony, not honesty. "Honesty" in a movie about a bunch of unprepared civilians being attacked by prehistoric monsters would have been everyone being eaten, sorry to say.

Aaaand I wouldn't call the way the movie ended a cessation of horror for anybody, unless you count the dead people. I imagine Tom Jane's character is headed for a padded cell, if not, uh...prison.

All of this is totally subjective, of course, but the novella's ending is the one I liked - it wasn't happy either, but it was hopeful. Which in the context of the story made the most sense.