Siri is absolutely Apple's way of tackling Google search. The one thing easier that navigating to your browser and typing is holding a button then talking.
Why then didn't they bring Siri to the new iPad in full? If you are going to do dictation why not allow the user to reschedule a meeting or ask about the weather etc. I'm sure Apple have their reasons but they would be interesting to know.
Siri seems to understand me most of the time. I tried Japanese Siri on the weekend but couldn't get her to understand anything other than "atsui desu ka", which is not surprising considering it's not my native tongue.
Australian Siri sounds the most natural to me. Even the vocal pitch and inflections are spot on for the content. When she apologizes she actually sounds concerned.