I don't know where to start...
Another movie written like a video game. There was no character development. I mean, they showed up for work, didn't seem terribly surprised when some zombie tree men from Pirates of the Carribean were crawling up a rock wall (but only right where they were, not anywhere else), got aroused as young attractive people do after fighting off rock climbing zombie tree men, abandoned their posts, batman zip lined away after a kiss (twice), and then lived the rest of their lives happily ever after in France totally anonymously with no one wondering why a random nuke went off in Russia.
Im still trying to figure out how like 3 tomato plants grew enough to provide a year's worth of nutrients in Russia for a relatively built adult man. I guess it doesn't matter when some WWII tech was gene splicing long lived mutant zombies that somehow remained completely secret and never left their hole since 1930. Hard enough keeping them there with modern fantasy gun-tech.
And its a good thing for the character's follow up to their one night stand that being stabbed in the abdomen by a toxic/infected stick doesn't actually increase susceptibility to the disease... toxin... stem cells... I don't really know... I guess it's airborne? But you gotta be exposed a lot a lot, not just a lot like getting compromised materials lodged in your flesh a lot. Like, just hanging around waiting for a few days a lot. But it doesn't ever waft up out the hole. Birds and insects never go in and crawl/fly out.
If you like watching Swiss cheese plot lines, this one is for you.