[dingfeng_quek]

You ask: 1. Is X good? How is it good? 2. Is it entirely separate from reality?

While you might think of it as a simple question, you asked it in the general sense, without any context. In the general sense, these are two central questions in 2 separate domains of philosophy. 1. Ethics/Moral Philosophy 2. Dualism (philosophy of mind). Neither has a simple answer, although you could start form Wikipedia or the Stanford Encyclopedia of Philosophy.

Furthermore, the idea and enterprise of science and math is complex. It's not familiar to the layman. Instead, try approaching the question with more familiar ideas:

Think of a person who doesn't use Facebook at all. 1. What does Facebook add to his life? 2. As far as he can see, Facebook is a purely virtual social network, isn't it? 3. Why is it worth everyone's time to check/use Facebook?

Think about it from the perspective of a non-Facebook user. Perhaps one of the tribesmen in Africa should you know any.