Madeline Kahn almost saved this one.
While her standout performances in Brooks' Blazing Saddles and Young Frankenstein were instrumental in making those films the classics they are, she was the only bright spot in this cringe-worthy spoof of the great Hitchcock. The only time I laughed was when she was on-screen, with that odd way of phrasing her sentences and her overall delivery. She was a gifted comedienne.
I think this marked the decline in Brooks' catalog, in terms of quality (Silent Movie was fair, though I'd have to watch a Keaton film afterward to truly satisfy my fix). After this, his comedy became too spotty and juvenile. Even Kahn couldn't save the train-wreck that is History of the World: Part One.
Buster Keaton made me quit smoking.