I don't claim to be a good writer. I realize that I repeatedly use the same words, phrases, and sentence structure in many of my postings.
I would like to imagine, however, that my vocabulary and writing skills have improved because of my voracious appetite for reading. Aside from learning good writing from good writers, I also try to learn how not to write from bad writers.
Who is a bad writer?
A bad writer has a flat writing style. He writes the who, what, where, and why in a robotic fashion and his writing has no soul; his words do not reveal a glimmer of his personality or his essence. He writes in long paragraphs which intimidate a reader and make the reader's eyes glaze over. The topics he chooses may be of extreme interest to a reader, but the way in which he writes immediately causes the opposite effect.
A reader does not want a regurgitation of facts, but rather something personal; the more personal the better. A reader wants to know how this story, teaching, or event affected the writer.
Although I don't claim to be successful in always writing in such a manner, this is the standard that I aspire to.