1. Shown us our first regeneration that crossed racial lines (Mels to River) opening up the canonical possibility of future regenerations of the Doctor being played by non-white actors.
2. The first compainion (Amy Pond) to travel with the doctor while married, showing girls that marrige isn’t the end-game and life can continue afterwards.
3. The first lesbian couple on Doctor Who to have a recurring role (Vastra and Jenny).
4. Allowing a woman in her late forties (River Song) to not only be an action hero but a sex symbol. How many other women on TV can you think of that fit that description? In a time when the media is telling us that women are obselete passed a certain age, River is both appealing, useful and mature.
5. In addition to above having River be excited about her regeneration into a older woman.
6. Having Canton Everette Deleware’s sexuality not revealed until the very end of Day of the Moon, making his back-story make sense in retrospect but also allowing the audiece to make up their own opinions on his character without bias.
7. Having Liz Ten be a black woman, showing the possibility for interacial relationships within the royal family. Imaging someone suggesting that fifty years ago. Hell, imagine someone suggesting that ten years ago.
TL:DR. Moffat’s not perfect and he’s not unproblematic. But hell, he’s also done some pretty progressive stuff.