Every smart home is different in terms of what it does and how it goes about it, but generally speaking the measure of a ‘good’ smart home is the extent to which it improves your home, and how unobtrusively it achieves this.
There’s no point in having technology for technology’s sake – if managing your smart home’s systems requires more time, cost and effort than would be required to do things manually, you may as well have hired a butler.
If your climate control systems are automated, for example, they should constantly adapt to keep the house feeling comfortable exactly where you need it. Ideally, this should be done unobtrusively, and in a way that ensures the maximum efficiency. You should also be able to easily and quickly override automated settings without having to wrestle with complicated controls, or trek to the other end of the house to do so.