If you ask from technical point of view, I like to read articles that have a specific purpose. For instance, to infrom, to express opinion, to help readers and so on and so forth. How-to hubs is a perfect example. In addition, great Hubs must have a variety of capsules for visualizing content and must interact with readers. That's a type of Hub I would love to read and take part in.
If we talk about certain content, I enjoy reading Hubs about health, hobbies, stories of people's life, science, technology, cars, new ideas and suggestions. I also love poetry and visual art.
What about you? What kind of Hubs do you enjoy reading?