Too predictable, not enough suspense, and not long enough

Very generic horror film. Interesting premise but cliche execution throughout.

The plot behind the movie was weird. The movie lacked purpose.

Left with more questions than answers. Who are the killers and why are they doing this, is not revealed to audience. Why was this place selected? Was the family familiar with this place before? Not enough clues to connect the dots. What took the sarcastic, rude and moronic daughter so long to figure out how to defeat "the strangers", or did she?