I've been into Dr Who for as long as I remember (I vaguely recall Troughton, but Pertwee was 'my' Doctor.)
And when it was brought back I 'kinda' liked Eccelstone... the "Run for your life" line gave a good idea of how he was going to play it, and ran well.
Then Tennant came in... And he re-wrote history.
He was a beautiful amalgamation of many of the best, past Doctors, and his sidekick wasn't another, squealing, "I've been captured!" plot device.
...and then Davies began to bring in his showbiz mates as cameos.
...and then there was the "Love Story".
And my interest plummeted.
I saw the first episode of Matt Smith, and nothing else.
I saw none of Capaldi.
My fear now is that after all the 'bravery' involved in creating a 'Female' Dr (Gender isn't quite the same thing in the Who-verse IIRC), that the writing will get lazy, or worse, self-referential to the fact that the Dr is a 'woman'... and god helps us, another love story. ("But we'll make this one with a girl just to stir the pot!")
Maybe I'm being a bit too cynical, but it just seems to have become Style over Substance.