The latest Siri commercial just hit, and like recent ad spots, Apple turned to a celebrity to endorse the lackluster iOS feature. And, also like the other commercials, the dialog between Siri and the user seems a bit more simple, almost mundane, in comparisons to the early Siri commercials. The first several Siri spots were filled with pie-in-the-sky optimism. They were very dreamy and nearly promised that Siri would change the world. But then people started using it and quickly discovered that Siri fell short of expectation.