Well I guess it's somewhat more useful in America, but out here it can't do any of that. It's been nearly 8 months and Siri hasnt shown any signs of improvement, we just get told "It's a Beta, be patient!" So all Siri can do for me is set alarms and reminders. Me personally I don't have any speech impediments or a regional accent, yet Siri normally has trouble understanding me. She's nailed setting alarms because thats all I use her for now.
Everytime people at work hear I have a 4S, they ask me to demonstrate Siri, and it nearly always fails miserably.
"Call Dan"
Siri: Calling Tom Field.
"No, Call Dan"
Siri: I'm sorry, I don't understand Core Dan
After seeing the commercial with Siri, I tried to get Siri to remind me to put the gazpacho on ice. It literally took me 30+ attempts, with Siri flodding my calender with reminders to "Put the Dispatcher on Ice".
Thats a shame I didn't realize it was different for other countries