That was my opinion until it randomly stopped being able to play my local music. I literally have a playlist called "Led Zeppelin Good," I say "play Led Zeppelin Good," it hears all the words correctly, then it says "Hmm, I'm having trouble playing that." Happens every time with every playlist. WTF is this trash. Seriously I wish I had iOS 7 or 6 again cause it used to work fine.
Another inconvenience is that I can't tell it to play music on YouTube. It says "here's what I found" then does nothing, or worse the results randomly go away like it's some glitch. I'm guessing the Android copy of Siri can do that. It's tempting.