Just wanted to say that I never, ever, ever liked Amy Pond, and it baffles me as to why she's so beloved. She contributed absolutely nothing, had no personality (beside being an obnoxious load), why do people love her so much? Am I just crazy? I've griped about Rose being too special, but at least I can see her appeal.
Similarly, I think Mel is a very underrated Doctor Who companion. Yeah, her screaming was annoying, but at least she had a personality and was occasionally useful. Plus, there's something so likable about Bonnie Langford.