I find it a little odd that people are talking about the plot holes and theoretical plot holes (what would a space whale eat) in a series that has always been about entertaining people and not really caring about the science. Watch any of your favourite shows and there will be plot holes everywhere, and that is when they are creating a drama for christ sake. In fact, just go watch 24, the tech and plot lines in that are so close to reality it scares me.
Just sit back, watch and enjoy.
Thats what allot of people do though. Good science fiction has rational explanations for things, bad science fiction is when you make it up as you go along im afraid. It makes a world of difference in a good story.
Ofc Doctor Who has always been a bit on the crazy just for the sake of it is a bit outdated. As i said before, people will be comparing this to other shows that are out there.