A 6/10 might be a little generous. I loved seeing familiar faces, but I feel like that's distracted many people from how mediocre the episode truly is. The story had a good setup but a terrible resolution. Ace, Tegan, Kate, Graham and Ashad were wasted. Dan and Yaz's goodbyes were terrible and had no buildup or emotional impact. The Doctor's regeneration didn't have any proper buildup either, though I did like how peaceful it was by the sunrise. The episode was visually stunning and entertaining, and it's music was good too. It was a mediocre end to a terrible era, I will miss Whittaker though.