Shoving my way in to your comment, hope it's okay.

Ten is being written in such a way that he comes across as... stupid? selfish? not at all clever or impressive?

To me, he's bordering on being written wholely unlikeable. And I never thought that would be possible for me. I understand Ten being written differently in order to show a subtle difference between the two, but you shouldn't change the parts that helped to build the character in the first place, and what helped to draw Rose to him as well.