The voice dialer on my droid has never worked. Not even a little. I just tried it twice before writing this post and saying "call Denise" resulted in nothing the first time and asking me if I wanted to call Jason or Casey the second time.
I speak clearly at an average pace. I find this really frustrating. I used the voice dialer on my razr for common contacts for 3 years and rarely had a problem.
The (at least my) droid has a problem with voice commands. It's so bad, I don't even have the shortcut on any home screens. It really sucks.
Any advice or just forget about this feature?
Did you try any of the advice on the threat? I don't know.. like the one above your post? Try importing your contacts into GMAIL?