When sitting down to watch PET SEMATARY, one might reasonably expect an adaptation of the Stephen King novel which, by coincidence, bears the same title. And, to be sure, there is a family who moves into a house behind which there is a pet cemetary. And, yes, there is a patch of land where a cat gets buried who comes back to life.
On the whole of it, it's a somewhat entertaining story, right down to a "Bet you didn't see that coming" ending. But the story of a doctor who believes there is nothing after death, who is then confronted with incontravertible proof that death can be reverse... That's a story that could have been explored with more depth.
Barring that, what we get is a zombie movie about a magical piece of property where whatever you bury comes back to you, but not in any pleasant way. In fact, one woul dthink after the first few dozen times of resurrecting murderous zombies, the appeal would wear off and people would stop doing it.