Too many people rate movies on IMDb and don't take into account the factors that go into a blockbuster, ie budget, budget and budget. Big budgets get big talent, lavish sets, expensive locations, etc. A low-budget movie like this one shouldn't be rated on the same scale as movies like Saving Private Ryan or anything from Disney or Marvel. They need to be rated against other similar movies in terms of genre and budget, which is why I gave this one eight stars.
For its genre and budget, this one is entertaining enough. It sets up the mystery, builds the tension and keeps the story moving forward. The acting is okay and the cinematography good. It looks and feels like it was made by folks who know what they're doing and are limited only by the amount of money they had to spend.