Primary use for such a feature would be true "hands free" in the car. It worked flawlessly when I used it yesterday.
When I talk about half-baked features that Samsung implements, I'm talking about features that work half the time and don't the other half - even when they are supposed to work.
There's a difference between not well thought out and somewhat unfinished...even though "Hey Siri" works as a finished product (it's only my opinion they will remove the restriction).
But hey, I hate Samsung and love Apple so - what do you expect. I could sit here and gush about how wonderful Samsung is and you'd still read into it what you think I'm about. I'm not going to try to change your perceptions or biases. I'll say what I say. You don't like it, tough cookies.
(nvm I called the GS4 - minus TouchWiz - one of the best smartphones of 2013 in my review last year....but I'm sure you missed "lurking" there)