They are as TVTropes.org in effect put them, good "unintentional period pieces" (http://tvtropes.org/pmwiki/pmwiki.php/UnintentionalPeriodPiece/TurnOfTheMillennium). For instance, take the first Scary Movie, where does in hindsight, feel like a film from the year 2000. It doesn't help that the characters are mostly just one joke (like the entire joke with Ray that is he gay).