“Weekend Deadaway” (*1/2 out of four) was a tired slasher thriller about a group of friends (Susan Slaughter, Jim Nieciecki, Emily Sue Bengton, and others) who converge upon a lake vacation house and find that (yawn) an uninvited guest is on the prowl to kill everybody. Clever title for a movie that seems practically spit out of a computer and made up entirely of spare parts. You know a horror movie is in trouble when you’re rooting for the killer to put everyone out of their misery.