While not the worst film, it was cursed with an excessive light-mindedness for the subject matter, and it cost the viewer suspension of disbelief.
It's a movie best watched on a whim, without knowing anything about it, because half the fun is seeing the actors and being like, "What, isn't that...!?"
The plot itself is basically a whodunit in werewolf form. This gives Cursed an interesting flow compared to most horror movies.
Unfortunately the script doesn't play this up to its fullest potential. The big loophole reveal at the end that allows everything to properly conclude would have been much better fit in to the early parts of the movie. Instead of a deus ex machina-esque, shoehorned-in statement that reveals a solution two seconds before it resolves, it should have been a major part of the unfolding of most of the movie.
The characters are all properly performed by their actors. They're cheesy, but in that horror b-movie type of cheesy. It feels appropriate for what the movie is. And as said above, half of of the fun of the movie is realizing who everyone is.