I thought the worms would be really, really, really, really, really, really, really, REALLY, big. Like they are in the cover of the DVD. But alas, the worms were only really, really, really big. So I was disappointed. Can you hire some bigger worms for the sequel please! As for the worm acting. Well... I believe there are better worm actors out there, but obviously, they are a rare bread... so understandably the production crew had to settle for what they could find.
One aspect of the 'human' acting that I found amusing: When there was a worm lurking and on the verge of attacking it would make a non-human growling grumbling monster sound (i.e. "Grrroworworoowwraaaarh"), but the human actors would inquire, "who's there! Who is that?". Me? .... if I heard a monster sound like that... I wouldn't be asking such a question. I'd be getting the F*** out of there.
I give this charming film 4 stars for the fourtitude of the production staff, since "fivetitude" doesn't sound quite right.