Excellent cinema, recommended to all.
Even my horror & monster-phobic wife liked it, with qualifications...which counts as a ringing endorsement.
Dysfunctional modern family takes on nature run amok while society fails them on all sides. Works as social critique, satire of modern life, family drama and balls-out monster film all at the same time...a neat trick.
Also has a kickass monster and really good direction. I can see adding it to the permanent collection, it's got plenty of replay value.