Yes, but also, he actually has moments where he is, if anything, even darker than Christopher Eccleston, although the jury's still out how he compared to Tom Baker, Colin Baker, and Sylvester McCoy's Doctors.
One case in point occurs in "School Reunion", or rather, a few. In one sequence, he admits to his Rose that the reason why he left Sarah behind is because he is effectively immortal, while his companions aren't. In a slightly later sequence, while confronting Mr Finch, he admits that he is so old, and becoming less merciful. And in another later scene, he is initially tempted by the Krillitane's offer to help them with the Skasis Paradigm, when he realises he can reverse the effects of the Time War. The Doctor is rarely tempted in such a way that he nearly gives in, and this is one of those rare instances.
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(No longer a mod)
On sabbatical...