I once knew a 13-year-old kid who decided to enter a short story contest by writing a piece of fiction about a bank robbery.
The story was pretty simple and straightforward. Four disaffected teenagers want to buy a car and drive out to California, but they don't have any money. One thing leads to another, and they rob a bank, using toy guns. They buy a car, drive to California, and live on the beach near Santa Monica, having completed the perfect caper.
Once the kids get to California, the story ended, sort of like this: "One day they were crossing the street and everybody got run over by a truck. The End."
Needless to say, "The" Ending for "The Pledge" is a lot like that. Otherwise, the story isn't bad, and the acting certainly isn't bad. Personally, I liked the direction and cinematography.
How entertaining is it? I'll put it this way - I was interested enough that I watched the thing all the way through, which is an acheivement in itself, since I find Jack Nicholson's "Man-driven-crazy" acts too tired.
However, as an intellectual execise, "The Pledge" is a joke. If the end of this movie was any more improbable, it would have drawn hoots and guffawws from any alert audience.