Bereavement is a slasher movie with some strong points - good acting (Michael Biehn, Alexandra Daddario and the rest of the cast) and a good cinematography and production value. The weakest point: the behavior of the victims is so dumb like they never heard any news of serial killers and maniacs or never watched some horror movies. So watching them killed I always thought - well , that's survival of the fittest, baby ;)
In a teenie-slasher with some elements of comedy such "behavior" of course is part of the deal, in a "serious" slasher like Bereavement it is not. On top, there are some
implausibility and issues with the story: many girls disappear but nobody checks on the weird guy living in a old slaughterhouse, is just one of them. Also the "twist" (no, I won't spoil) I saw miles ahead coming and is just a cliche that wants to shock but can't, at least not the "serious" horror audience.
Well, with a more refine and plausible plot this movie could be easy a really good slasher. So it is a solid one, that is in the end not in every aspect convincing.