I thought the earth had been returned with the other planets, until they said it hadnt been. It was a wtf! moment. I also think that in the past 2 years, the Doctor has managed to get over Rose, but not the other way around. However, the "clone" obviously hadn't. As he was fresh to the emotions, and was able to say "I love you." to Rose.
Alas, do not forget that the Doctor would have prefered River, as she actually knew his name and Rose never did. I presume she will now, or possibly the "clone" will change it.
Apart from that I think it was a well conceived episode. Very visually appealing. However, I think that the constant resurrection of the Daleks and Cybermen should perhaps be stopped.