There’s these sea monsters in Ireland that, yup, grab people. They have tentacles and an appetite for human flesh.
When the natives realize that alcohol to these monsters is like holy water to vampires, they all get super-trashed and the monsters leave them alone. Any monster that tries to snack on a drunk person pops like a water balloon.
After this plot point is out of the way, we get a Sean of the Dead style splat-stick where a gaggle of foul-mouthed gregarious Irishmen (and women) drunkenly beat up amphibious CGI monsters. There’s a variety of monsters ranging from chicken-sized face-huggers, to dog-sized octopi, to a building-sized full-fledged sea monster. They all get literally smashed by figuratively smashed, inebriated gingers.
Yeah, this movie cheaply relies on the stereotype that Irish people are wont to be drunkards, but it was somehow entertaining to watch people stumble around and bludgeon purple carnivorous octopi with table legs. Way more entertaining than other horror movies I’ve seen that shamelessly rely on stereotypes to carry the plot.
I actually got into the spirit of things and I got black out shit-housed while watching this one. So, I dunno, maybe it deserves better than a C+. Maybe worse. All I know is that it was a swell, hair-above-average time taking belts of Jameson and watching this one.