I'm of a couple minds about the casting. On the one hand, lots of respect for Capaldi, and like you I'm happy he's older (though a small part of that is schadenfreude over all the fans going "OMG HE'S OLLLLD" "WHY ISN'T HE HOT NOOOOO").

But I really do wish they'd shaken the mold a little bit with someone not-white or not-male (but I'd only take a female doctor if Moffat wasn't writing her).

Regardless, I'm waiting for the day when Moffat announces his departure. He can take his gross comments and gtfo.