See that I can agree with, the previous two episodes were too "RTD" let loose so I can see why it would put people off but it's a shame when we get a banger of an episode by someone like Steven Moffat which is just full of his Sci-fi shenanigans and people still call it shit.
I haven't watched it, but from the description I read you could probably have easily dropped Boom into a Matt Smith season, so I can see why it felt better. Shame that the quality of the show has plummeted since he was The Doctor.
If they'd have brought him back instead of Tennant, for the final season he says he wished he'd made, with a different group of people behind it, Disney would have a bone fide hit on their hands. Right after the 50th anniversary, the show was hot property, with a huge fanbase across the world.
Then they replaced the young, charismatic guy with the old grumpy git that put loads of people off, and the story quality dropped right off as well. Then it was into identity politics as the main driving force, and look where we are now.