I have mixed feelings, but mostly positive. The last few seasons have been filled to the brim with gimmicks, and traded in real character dynamics and chemistry for convoluted plot twists. I don't know how this guy will choose to run Doctor Who, but given the season delay (another bummer) it would seem he's going to carve his own path separate from Moffat's, which I'm okay with. He wrote the Tennant episode 42 which was really good, but he also wrote Power of Three have many, MANY problems with[footnote]First, defibrillators don't work like that. Taking liberties with science fiction technology is one thing, taking liberties with actually existing technology which is used in medical emergencies is downright irresponsible. Second, given the length of time people were dead before the Doctor restarted their hearts, they would have all been brain damaged beyond repair. After four minutes of no blood pumping through your brain, there's nothing functional left. There's no way less than that amount of time passed, and they never addressed this issue in the episode. I don't care if they had just covered it up with some technobabble, the fact that the issue was never even brought up just screams lazy, ignorant, and unedited writing. The ending was rushed, and the enemies were never fully explained, and the aliens in the hospital were never fully explained.[/footnote] A decent episode if you pretend the ending didn't happen, but that's a trademark of too many episodes during Moffat's time for me to be completely comfortable with this guy running the show.
I'm just hoping this guy dials it down a bit and starts to throw in more character-centered conflict, as opposed to plot-device centered conflict. Moffat doesn't seem to realize that the entire universe doesn't need to be in jeopardy in order to make an episode dramatic or epic. In fact, having the stakes so high tends to become undramatic, because you know the universe isn't ACTUALLY going to be destroyed, and things will soon be set right. But if you've got a room full of solid characters you've grown to care about and the plot armor is off, then you've got a tense thriller on your hands.
Also, no more god damn plot holes. Moffat has on more than one occasion had to clear up details about his episodes in interviews. That's all fine and dandy if these details were in your head and make the story make sense, but if you fail to convey these details to the audience, then the problem isn't them for not suspending their belief enough. The problem is YOU for not conveying your story properly.
