I own a Google Home and I struggle to answer this question. It can do lots of simple stuff sort of well. Activating light switches by voice feels hopelessly inefficient to me when you compare it to just using a light switch - especially when you factor in the cost of the hardware involved. Playing music is also fine if you know exactly what you want, but browsing is pretty terrible. Video is kind of cool ("play show X from Netflix on my TV!") but controls like pausing, rewind etc are also very difficult without reaching for the remote you could have used in the first place.

When it's useful it's great. But it feels like a tool trying to find a purpose still.