This is what causes my love-hate relationship with Siri: when it works, it's a fantastic experience and gets little details like this spot-on; when it doesn't, it's off by a mile. More frustratingly, it doesn't seem to improve much between major iOS releases despite being mostly a thin client to Apple's services.

To be fair, I generally prefer obvious failure rather than quietly doing the wrong thing (which is what probably would have happened here), but even really simple stuff like "take me home" only seems to work as expected half the time.

(I'm ignoring situations where the voice recognition fails outright, since that's a totally different problem - this just relates to handling of correctly-interpreted commands)

Like many others, I wonder what Apple's QA and user feedback processes look like with Siri. Unlike Maps, there's no way (AFAIK) to report a crappy Siri response, so while I'm sure they have stats on low-confidence speech-to-text results, I'm not sure what they do to determine "you heard me right, but you did the wrong thing" or "doing X instead of Y would have been a lot more useful". As such I assume most of it is internal QA process, and Apple's secrecy around new features (fortunately Siri no longer qualifies as such) definitely hurts QA that requires a lot of real-world usage.