SACD is good for multi-channel playback. I listen to lots of classical music, and the SACD's sound great on my 5.1 system. You are brought into the larger soundstage. The fact that the information is in the DSD format means nothing to me on that system. As was said, my Oppo converts the DSD to PCM and sends it to the Anthem receiver which converts everything into a 32 bit PCM signal for the DSP. So on my 5.1 system, I've only ever heard what is produced by the AKM based DAC after bass management, ARC. etc., etc.
Listening to multi-channel playback is great with a dialed in system. SACD's provide a great musical experience. Blu-ray discs (2L - the Nordic Sound) also provide audio formats like 5.1 DTS HD-MA 192/24, 7.1.4 Auro-3D 96kHz, and 7.1.4 Dolby Atmos 48kHz for those who have an Atmos set up. There's nothing wrong with multi-channel playback in music any more than there is in playback for a movie. SACD's are fine.
edit: When it comes to hi-res files, I have no problem at all listening to a 2xDSD binaural native download on my headphone system.