Does the change in plot make the new Doctor a lightweight character? I don't think so, the classic series placed him in enough moral dilemmas and saw him making enough bleak choices (as with the original, and far superior looking, Silurians) to retain a cloak of darkness that gives him depth. Though the idea that only those with blood on their hands can be considered interesting or complex is a somewhat bizarre notion.
Having spent 50 years worth of episodes running away, the Doctor has taken Erich Fromm's recommendation and finally has something positive to run towards. Of course, when he finally reaches his destination the chances of it being all roses round the door and joyful welcomes are likely to be slim ~ there will be a whole world of drama to be milked in that for years to come!