Most of the time I use Siri its because I'm driving, and I have a 25% success rate getting useful information.
The other day I was driving and I knew I was near the border of Indiana and Illinois, and I simply asked "Hey Siri, what time zone am I in?" and it couldn't answer! It was all, I'm sorry I can't show you while you're driving. Don't show me - just tell me what time zone I'm in! You have my location..
I have a contact on my phone "Mom & Dad" - its the landline at their house. When I ask Siri to call "Mom & Dad" while driving, it says something to the effect that it can't call two people / setup a conference call. I don't have any contacts named "Mom" nor a contact "Dad" - why why does it think I'm trying to call two people?
My kids practice sports are a nearby park called "Lincoln Park" - but it always tries to send me to Lincoln Park Zoo in Chicago 300 miles away if I get directions via Siri. Why? Perhaps it should take my location as a context clue. If I open Apple Maps and type in "lincoln park" it shows the location I want, 10 miles away. Why does the same input via Siri and via Apple Maps result in such wildly different results?