It's hard to escape the comparison between the fantastic Tremors and this Irish take on a remote community besieged by monstrous forces but there we go. It's not quite as good as Tremors.
It does slightly less with it's 'grabbers' than Tremors does with it's 'graboids' and the character interplay is not nearly as sharp. The main character is a fairly one note alcoholic so it's hard to know quite what the new female arrival on the island sees in him.
The jokes are ok, certainly good enough to cover up some ropey plotting and the monster design is fine.