Rose and 10.5. I kind of bounce back and forth between being able to roll with it and wishing that Rose had never been brought back at all. I think giving her and the Doctor a clean break at the end of season 2 would have been very nice, and while I was excited that she was coming back, it was all very rushed without much payoff. The show needed more time!
But mainly, I don't like The Doctor's excuse for leaving Rose in Pete's world. It just was not a very satisfying cut off, especially when I think about how RTD gave himself the perfect out for making Rose stay but didn't use it. He put it right there on the flipping beach and all she did was stand there quietly and not say anything. And by that I mean Jackie. I think that Jackie should have kicked up a fuss and begged Rose to stay, and Rose would be conflicted, but The Doctor would be like, "I think you should stay blah blah blah." I have the whole scene mapped out in my head.
And then The Doctor could choose that time to kick the human Doctor off the TARDIS all like, "I need you to stay and look after her for me," or maybe turn to Rose and be like, "But you won't be alone," and such and such.
Especially because, I look at it this way. Martha spent almost her whole season being in love with The Doctor, then grew up and decided it was time to walk away and leave him for her own sake. A big theme with Rose was that Jackie was the single mother left behind with no one and was so lonely and worried about her daughter all the time. It seemed like Rose was always so keen to just run off and leave her own mum behind.
How beautiful would it have been, then, if by Journey's End she had done some growing up and actually finally chose her mother over The Doctor? It would have brought her arc full circle to a satisfying conclusion. It would have been beautiful.
But no, we get the Doctor all like, "You have to stay and babysit my clone."
Not that I hate what we got, but at the same time, I see potential for better and it's like, ugh no why?