Jae: Question "Is it good?"

I think I can confidently state that I have horrible taste in a lot of stuff. I can't think of topics on top of my head, but usually, I do find myself enjoying things that even I would admit are "bad".

It's a pretty generic question, but I'm always wondering the composition of what makes a book "good". To put in an inquiry/sophisticated sense, I was curious about how an agent or editor examines a book. Rather, I'm wondering if/how their perspective, based on their occupation, would change in comparison to the times they would leisurely read a book. Is there a sense of an officiality behind the evaluation of a book? Or it a gut-feel that people just have when they read? I don't think there would be a universal answer that can be applied to all of the publishing industry, but I was always interested in how people see the book through the lens of the people with jobs that makes book a possibility.