I think it is just me but I find this 'book me a concert and fancy dinner' schtick rather boring. May be well off people are so busy and book these things so often that these virtual assistant really save time if price is of no concern to them.
* Quick conversions "How many Tablespoons are in a Cup"
* Setting Reminders "Remind me at 9:30am today to pay my rent"
* Setting Timers "Set a time for 10 minutes"
Anything else and I can normally do it faster. That's not to say Siri couldn't beat me at doing something but that I have to repeat myself or I get the dreaded "I search the web and found this..." Not only are the results normally shit but it's Bing.... Need I say more? Timers, conversions, and reminders are the only thing she can consistently beat me on. Also I RARELY use her in public as it's distracting/annoying to the people around me. Reminders in the only thing I will use in public and only if I need to enter it in fast. If I have the time I'll manually enter it.