I was upset about the Doctor just leaving her, until I remembered that this is the Time Lord who locked his own granddaughter out of the TARDIS and left her, because it was what he thought was best. It was perfectly in character, heartbreaking though it was.

But yes, Rose and Jack was swindled of their reunion, and doing that to Donna was brutal and unfair. It'd have been better if she died, but she got to live a diminished life because the Doctor couldn't take someone else dying for his sake.