Who the hemorrhaging **** thought the moron behind Dinosaurs on a Spaceship and Cyberwoman was a good choice? He was serviceable in Broadchurch, but a down to earth, human drama is very different than the grand spectacle of DW, and his talents don't translate worth a damn.
If Jodie had some good material, she'd probably shine, but as-is Thirteen just seems like a flat character.
Also, somebody needs to teach Chibnall how to write a coherent ending. "This supernova is creating a convenient vacuum tube the size of a small octopus, aren't I so clever, tee hee" is not a satisfying resolution to an episode. It's worse, because the setup (Dalek mind control) is genuinely creepy, and then it's just ruined by "they all lived happily ever after." The only good episode ending the whole season (in Rosa) wasn't even written by him, and it was still ruined by a ****ty pop song.