An excellent product is one that has the following characteristics:
Task-oriented — A product is a tool to reach a goal. A product is not a goal. You should be using a product without even not noticing you are using one. With the right product, you execute tasks with excellence.
Care— The experience is awesome, and signals that someone has been really caring about you. You feel you are in a great dimension where all work in a pleasant manner. You feel “wow, these guys really thought about this”. You feel that you are accomplishing the tasks you want in the way you love and that the tool really understands your feelings, in a long-term frontage. Great products are durable because they were conceptualized foreseeing what “could happen if”. “When you make something with care, even though you don’t know who the people using it will be, they will sense it.” Said Jony Ive, former principal designer at Apple.
Simple — Where complexity is distilled in a simple way. You don’t have to think, and it’s fun to use. Everything comes naturally.