I am having the EXACT same trouble with my new 4s! I switched from a Blackberry to the new iPhone 4s on Sprint, but so far, the Siri feature has been useless. I cannot seem to voice dial anymore. For example, I have three entries for my Dad -- separated by different names: Dad Home, Dad Mobile and Dad Work. Three seperate entries, not one entry under Dad and then separated by fields. This worked better on Blackberry, saving me an occasional second step of answering, "Which Dad?" By making a separate entry called "Dad Home" that is all I needed and the phone would dial his home.
But Siri cannot even get that far. I say, "Call Dad Home," and Siri responds with, "Which Dad? Dad Home, Dad Mobile or Dad Work?" I say again, "Dad Home," and Siri just repeats the same question. This goes on over and over again. It will NOT dial my father's home automatically. I have to then pick up the phone, look at it and then highlight Dad Home.
I have a lot of entries in my address book that are like this.
Siri really sucks.
I want my OLD voice dial feature.
So, bleomycin -- you are NOT alone. And the other users -- sheep -- on this site have been extremely rude to you, I see. Siri is simply not working for me either.