Basic premise is something we've seen countless times. Secret military base with monsters. Bunch of soldiers fighting for their lives. Same old, same old.
Nothing really new here. Pretty much by the numbers.
The special effects are just as average as everything else. Nothing too special. Not terrible, just your usual rubber suits and squibs.
The acting is... alright. The characters are all very one note. Everyone has their role, the muscle, the ass, the doc, the heart, etc... again, all as expected. The acting is serviceable.
The writing... meh. Tons of stupid decisions being made. Lots of nonsensical stuff and contradictions. The monsters are both nigh invulnerable and able to be knocked out by a punch. They can take countless rounds from high powered rifles, but a hammer to the head takes them out.
There's also a lot of magically teleporting moments. Like when a monster is there to grab someone when they weren't there a second ago. Or how there's a ton of them everywhere, then suddenly the place is empty, then it's full again when they need more action. Just very badly directed.
If you turn your brain off, it makes an adequate action flick to waste time with. But not really worth bothering with if you're looking for something beyond made for TV trash.