I have enormous love for Nine. He was adorable, and 'Rose' is probably one of my favourite Doctor Who episodes.
He was a different kind of Doctor. He had a seriousness and a gravitas and an angst about him. You really believed that he had been through a great War, that he'd seen so many terrible things.
He could switch moods on a dime too.
All the doctors have their positives and negatives, I've never understood why people argue so much about it.
Nine is definitely criminally ignored though.