In reality, a writer is really an observer. They observe how people react under different situations and attempt to breath as much life into their work as possible. To be able to convey what is going on in the characters minds, how the world seems to work and the plots as they play. The ability to bring an audience to it's knees and raise it up again with the stroke of a pen. To craft a plot which makes the reader crave more, to the point the reader is begging for relief. That is a writer, someone who can drop you in the middle of a book make you see, feel, hear and believe the world they create.
There is no such thing as a good writer. There are only observant ones.