I use Siri every day for dictation, sending emails, replying to texts, and setting reminders. I guess I asked it nonsensical questions on the day I got my 4S...

I use Siri every day for dictation, sending emails, replying to texts, and setting reminders. I guess I asked it nonsensical questions on the day I got my 4S... but not since then. I would say: yes, it is useful enough to "kill."