I've evaluated at least 57 soundbars. That experience has taught me there are two attributes a truly great soundbar should possess. First, it should sound good. Second, it should work like it's part of your TV-i.e., it should power up and shut down when your TV does, your TV's remote should control volume and mute on the soundbar, etc.
By this measure, there's never been a truly great soundbar.
Sonos-known for network-based audio devices such as the Play:3-has attempted to create a soundbar that would meet my definition of "truly great." How confident is Sonos that the new $699 Playbar will work perfectly in concert with your TV? Pretty confident: The Playbar doesn't come with a remote.