Siri just sucks, let's be honest.
I've tried to use it many times. It's not usable to me.
I might be asking for too much, or the non-US version is subpar compared to the US version, I have no clue. What I know is I just don't use it whatsoever, it fucks up 90% of times.
Worst is the fact my colleague's "Google Now" (I think?) thingie on his phone works almost perfect. Why!?