We are so deeply entrenched in the nostalgia wave now that we are returning to franchises that were never any good in the first place. Step forward Scary Movie. After 3 Wayans-less installments (an oversight rectified by there being at least 11 family members listed in the credits), they are firmly back here. As all parody movies invariably are, it’s a mixed bag; a scattershot assemblage of gags and references thrown at the proverbial wall in hopes of some sticking.…