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Well, I think that's unfair. I mean, the Copycat Doctor, half-Doctor half-Donna, you know, he is human too. One heart, no regenerations, the lifespan of a human, that kind of stuff. But he can keep his memories, even if his (brain) anatomy isn't Lord of Time’s anymore, to the very point of regeneration from the hand, he can remember! But Donna wasn't allowed to…
And again, if the Doctor can wipe all her memories about him and their adventures, why cannot he wipe only his old ones, before Donna’s era, and leave that amount she can bear, which obviously is not only valuable but creates a full new character? Oh never mind me, I'm just upset they let Donna go that soon, at least one more season would be great, wouldn't it?
And just one more thing. Human-Doctor, who stays with Rose in another universe, isn't just half-human, he is literally half-Donna. I mean, how astonished Rose will be when her perfect man will shout ‘Oi Earthgirl’ at her? Cannot stop laughing at that point. Hopefully Rose really likes Donna after the Journey's End travel.