Treating her better, doesn't necessarily mean to give her back her memories and givng her a happy ending. It just felt to me that Donna was given the short thrift at the end of the episode concerning her relationship with the Doctor. Yeah we had the 'best friend' comment earlier in the episode which was great, but then we could have at least had at the end Donna going 'Oi, where's Mum and Gramps gone?' and then when noticing where they have got to saying 'Who's that man?' While the Doctor gives her a sad look as he turns away from her to stop her from remembering. Just something simple like that. Both Martha and Rose got to see him one last time, but for Donna no. Yeah, if she remembers she will die...but as shown in Journey's End he can be there without her actually having to remember. At the end of the day, the last 5, 10 minutes of the episode were incredibly self-indulgent for each of the characters, except really Donna. You would have thought that RTD would have wanted to tug at the heartstrings a bit more where she was concerned, some more highlighting of the tragedy of her predicament. More sadness from the Doctor since his best friend will never ever remember him, especially now that he is going to die. This was really my only gripe with the episode.