John Krasinski of television’s “The Office” made the unfortunate decision to hitch his rising star to Robin Williams for his starring debut. Williams is operating on all annoying cylinders as Reverend Frank, who leads a marriage preparation course for Krasinski’s Ben and his fiancé (a completely wasted Mandy Moore). Williams’ wackiness amounts to tired jokes such as, “On the honeymoon, pretend to be surprised.” While watching this, pretend to be entertained.