Like I said you didn't understand. The Doctor saved Gallifrey, only for it later to be destroyed by the Master.
It's not down to you to say what Doctor Who should be about. It's down to us, the fans.
I wouldn't mind if you were honest and admitted not liking it because it's British and there's a female lead, instead you go round the houses cutting and pasting others to try and prove your 'point.'
It's not the first time criticism has been aimed at the programme when there's a change of direction.
Jon Pertwee's Doctor was similarly criticised for spending all his time on Earth, but nobody mentions that now. Some people are just resistant to change.
Please promise me you'll not watch Utopia, there's no way you'll understand all the plot twists in that.
This story followed a long tradition of SF warning of dystopian futures. HG Wells The Time Machine came to mind, not the main bit with the Eloi and Morlocks, but the bit at the end where he travels to the far distant future where there only seem to be giant crab creatures roaming about.