Backstory?
Would've thought with an A-list cast like this and all the marketing we would get more backstory or hints to the origin of the creatures/aliens/monsters. The plot was basically B-movie without a backstory. Tension was good, acting was good, just wanted more info to where these things came from, how long they were there, etc.
3 out of 5 without that. 4.5 out of 5 with it.