My opinion is based on my own experiences with what I felt were "good" nurses and "bad" nurses. The things I list aren't all encompassing of the qualities that make a good or bad nurse to me. They are just some things that I saw that made an impression with me.
good- didn't talk down to me or my family, was patient, sympathetic, asked me questions and listened to my answers, did not act bothered by my questions or like they were stupid,
bad- impatient, grumpy, not really listening to what I have to say, assumes that I am either unintelligent or uninformed, talks down to me, pushes or applies pressure to make a decision that the nurse wants, not necessarily what I want, doesn't seem to view me as a person, just a job that needs to be done.
These are vague, I know. What constitutes a good nurse or bad nurse is highly subjective, unless she/he is making repeated mistakes that put a patient's life in danger.