"Seriously, that's the ending?" and other reactions

A while ago I watched Bill Paxton's 2001 film, Frailty, a story of religious fanaticism, a highly dysfunctional family and an unreliable narrator. It's twisty-turny kind of a plot but its the ending I really want to talk about, it reminded me of another film. This one, released in 1998, is Fallen, a supernatural thriller and like Frailty it leaves the viewer somewhat...deflated. Needless to say there are spoilers ahead.

Poster from IMDB