This is aggravating. I sent a fairly short text to my wife today - asking if she wanted Coffee and gave her two choices. Siri said it was too long. It wasn't even half a text message max.
This essentially ruins Siri for me.
The Google app can do on-device speech recognition. Siri needs to do that in iOS 7. I don't care if its in beta, but what I do care is that Siri is useful. Before today, it was useful. Now half my Siri "conversations" don't work.