Entertaining but predictable
Saw it at a preview screening. It was a good B-grade action / horror film but didn't bring anything new to the table. The story beats were pretty predictable: it's a mash-up of "Frankenstein's Army", "The Chernobyl Diaries", "Dog Soldiers", etc with the occasional nod to "Aliens".
It's also not connected to Cloverfield.
On the plus side, it had a lot of satisfying gore, the action was clearly filmed (minimal shaky cam), and it was waaaaaaaay better executed than schlock like "The Predator" or "The Nun".