Just saw it and it left me cold.
It felt like Close Encounters, Signs, and Insidious thrown in a blender.
Sinister, Insidious and Dark Skies are way too much alike. With Insidious 2 on the way, this team better come up with new ideas fast.
It just did not have the creepiness of Insidious or Sinister for me, the acting was just ok as well.