That is near the success rate I have as well. And when I dictate a text on my phone voice works great because I can retype the one in twenty words it gets wrong. There's no keyboard on a watch. Worse, when you are misunderstood Wear is likely to launch the wrong app or pull up the wrong information. So you have the problem of canceling one thing and trying, awkardly, to get to what voice didn't understand.

If you look on the wear store, apps that create rows of icons on your watch face are very popular. I think that shows that this is a common concern.