It's been out for 6 months now. Siri should have improved, but instead it's become useless.
That's odd. I'm Dutch, I have a horrible accent, something like a cross between a Texan and an Ozzie, and I've just been playing with Siri for an hour. Most of what I say is recognised correctly the first time I say it (95%?). Siri has a serious problem with finding contacts, but, I'm used to the Dutch way of pronouncing 'Gerard Jansen', so it's hard to guess how Siri would pronounce (and thus recognise) that kind of name.
Despite me being Dutch and flaunting my horrible accent Siri is actually usable for me. Some thing are hard (contacts) and some things are impossible (locations) but in general Siri is a useful addition.