I friggin loved it. Just like 10 Cloverfield Lane, this confirms what I suspected all along. This is a(n unofficial) retelling of the Half Life universe as a series of films, and holy shit the way it builds up the universe after the first two is amazing.
By itself, I'd give it a 7. It's not super hard sci fi, it's mostly like what I hear Event Horizon be described as. "Spooky stuff goes on on a spaceship while a sci-fi plot happens in the background." There's some really cool themes about the energy crisis
But honestly, this is the first original cinematic universe since Star Wars I give a shit about. Its strength is in how it makes Cloverfield and 10 Cloverfield Lane work, as it's sort of a prequel to both. This is the Black Mesa incident of the Cloverfield Multiverse.
Spoiler: show