Personally I like Doctor Who because it's a continuation of my golden age of childhood TV. Like I posted above it's always had a message. Sometimes subtle (Delta and the Bannermen) , sometimes a fist to the head (Orphan 55, The Green Death) That's irrelevant to this complaint.
What's relevant is the incessant complaining about the same stuff, over and over. It's dull, it's boring and it drives away any conversation about the show.
I look back almost fondly on the "Moffat is ruining this show and must GO" diatribes.
So is cutting a blank check simply for our fondness of something. Really: I liked ST:TOS, but some episodes were real clunkers. And just because something has the ST brand doesn't automatically mean that it's good.
But since you mentioned one of my favorite episodes, Delta and the Bannermen, that's a good example of story first, message second. And a good story, indeed. Fun, deliberately over-the-top, a nice dig toward the 50s craze, and comic relief in the form of two bumbling American agents.
Now: I did catch part of one episode of the Dr Who revival, and...I wasn't impressed. Seeing part of the next and a repetition of a same theme had me going "No, thank you." Not repeating the same theme can be hard when writing, as I caught myself almost doing for a current work in progress, so I'm not trashing them for that. But it does get tiresome.