I think one thing Russell T Davies has cemented in returning is that the show is ok to be fun and casual. The past several years have often lost this core element.

Doctor Who is inherently a little silly, and it’s on a smaller TV show budget than the expensive shows of HBO etc, and if it takes things too seriously, everything becomes hard to like because the cracks show very clearly. When the show is being fun and casual, it can still have serious moments which hit hard because it’s almost unexpected for the genre. The past decade of who has been serious way more than necessary and honestly I’m glad we get a goblin musical episode.