Anyone else find Siri's got worse with iOS 7?

I seem to be getting the "I'm sorry, I can't take any requests" or "Something's gone wrong" messages much more often than before - probably around 1 in 10 times. Generally if I try again straight away it works.

I had hoped the voice processing would be quicker too, but it seems to take at least as long to deal with a simple query like 'text my wife'.

It's a shame - Siri could be so useful if it was faster and more reliable.

(Using it on a 5c for reference)