There were some really good horror segments. However, the long stretches in between them weren't that interesting and consequently, the film dragged at times over its two hours plus.
There is a very good supporting cast in Linney, Patton and Bates which helps the routine screenplay. The "Search for Mothman" featurette is worth a watch.
It failed to hold my attention because an hour and a half of the lead character was hard work – at times his immovable face looked like it belonged in a museum – and there was little in the supporting cast to provide a distraction.