Interesting that there is very little discussion here about the current series and I think it is because this series has been awful so far.
In the first episode, the new Doctor had to get re-acclimated, but it seemed like all of the main characters had lost their memories for the first few minutes. Another thing was that the Doctor was very distraught over the fate of the dinosaur, but then in the blink of an eye seemed to be completely over it and never brought it up again. Also, the green screen effects were off-colored, which reminded me of 1970's sci-fi.
In the second episode, they all drop into a vat of gooey human stuff, but then in the next scene they are all as dry as could be. No sign of the goo at all. Also, what was the purpose of the obvious references to "Fantastic Voyage", "Star Wars", and "Star Trek: The Next Generation"? Was it supposed to be an homage to those sci-fi classics or simply lazy writing? And finally, a companion bossing the Doctor around and slapping him? A wimpy Doctor just doesn't work for me.
Neither of the first two episodes have engrossed me the way previous series have. I believe it has nothing to do with Peter Capaldi, but everything to do with bad writing. And it makes me sad because I love Doctor Who.