It's not the worst movie I have seen, but I'm sorry to say it was a GIANT let-down compared to its predecessors.
They should'vie stayed off making it. Or at least saved up a little bit more material before having another go.
There are a few serious pokes in the general direction of various American famous people and it's hard not to enjoy them. I laughed hard when I realized they were going do do a remake of the "Tom Cruise jumps in Oprah Winfrey's lounge" but my laugh got stuck in my throat quickly as they overdid it.
They stretched almost all material too thin. It's sad because I thought the previous Scary Movie movies were good fun.