^
Besides Charles Spencer, Princess Michael (who got quite a bit of grief over her comments about Diana) and Peter and Autumn (their wedding photos), none of the other family members have gotten much criticism.
I took a look through Laura and Tom's thread and the only criticism Laura seemed to get for that interview, was when someone thought she was sharing a private conversation that she had with Kate. Other than that, no one cared that she talked about her famous family. Same with Tom. He recently did an interview where he discussed how he felt when his mother's affair came out, and not a peep. That goes for the others as well - Zara, Mike, the Queen's cousins. They have all done tons of interviews about their family, yet I rarely hear comments about them needing to stop talking about them.
Meanwhile, the Middleton's can't be seen out in public (or even sell products for their business), without someone accusing them of being social climbers that are cashing in on Kate's fame.
I completely agree with you about James. He did totally fine in this interview and in the way he handled the questions about Kate and George.