Least Favorite: I don't know whether to say Crusher or Bashir. Crusher was just sort of bland and didn't leave much of an impression either good or bad. Bashir gets on my nerves sometimes, but he has his moments. He also gets extra credit for being the cutest doctor.
I guess I'm in a small minority here, but I really like Pulaski. She could be opinionated and stubborn sometimes, but that's part of what makes her great. Some of the greatest character moments of the series were her arguments with Picard. If she had stuck around longer and the character developed more fully, she'd be my fave.