Anecdotally, if we'd ask a real person "where is a good place to eat" the chance we'd go there without more information is slim. And if we don't even trust people, trusting Siri will be a while.
What we're really doing with these questions is making our hunger known, and starting a conversation. We actually don't care that much about other people's thoughts, and we may not even have anything in mind yet as far as where to eat. We do care about how people feel if they are someone we care about, but the thinking part we love to do ourselves.
So to offer a service that "thinks" is rather misguided, and may even constitute a disservice. We already rejected the talking paperclip in 1996 [0]. It's failure wasn't it's intelligence, but in the value proposition itself. To have a paperclip presume to know better and to tell you what to do was not tempting. It's failure was it's existence.
Is it a glitch in the Matrix or is their pitch for Cortana identical?
> What is Cortana? Cortana is your clever new personal assistant.[1]
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[0] https://en.wikipedia.org/wiki/Office_Assistant [1] http://windows.microsoft.com/en-us/windows-10/getstarted-wha...