Agreed. "Vale Decem" is tied with "I Am the Doctor" for my favorite piece of new Doctor Who music.
Its one of those things that you just can't imagine OldWho doing. Just utterly brilliant.
Much as I love McGann, I don't think he would have fit into "Day of the Doctor" in the same way that John Hurt does. I feel like McGann, even after being exhausted & grizzled by the Time War, still wouldn't have been enough of a contrast when held up against Tennant & Smith. What works about Hurt is that he's kind of a stand-in for the old, pompous Doctors of the early classic series, like Hartnell & Pertwee. Putting that gruffness against the giddy childishness of Tennant & Smith shows just how far the character has come over the show's 50 year run.
But you could showcase McGann in that light, as well. Just show him with grey hair and a moustache, short hair, and he'd sell it. It was the BBC wanting a big name to sell the anniversary that ultimately prevented this, which is a huge shame, because McGann, I think, would've been ever better at it than Hurt was. And not because his arc would completed the circle or starting out with hope for the future, not having any by the end of the Time War, and giving it to 11 when he(they) save Gallifrey.
Sadly, I think the regeneration stories for both T. Baker & Hartnell were hampered by behind-the-scenes stuff. "The Tenth Planet" had to be hastily rewritten to accommodate Hartnell's failing health, which is why he's completely absent from Part 3. (Which makes it all the sadder that Part 3 is actually the last surviving episode of the Hartnell years.)
I don't get it. Doctor Who, especially back then, was a huge show, one that they went to great lengths to extend its lifeline for at least 3 or more years if possible. Why not accomodate the poor actor, who made the show popular in the first place. Its bad enough he'd driven off against his will (not fired), at least let him finish the last story he'll ever make. Its a damn shame he wasn't allowed to go out on a bang, because he deserved it, more than any other Doctor since.
And I have to admit, I always liked Tom Baker's last season. Its not, however, better than Douglas Adams' previous, simply because it lacks brilliant pieces like
City of Death or
Shada (maybe good ol' Douglas should've written something for the season?

) but it does bring the Master back in style (Ainley being pretty good here, unlike other times that he's not allowed to be this good), and I simply like that the series feels a lot like current DW, with an overall arc connecting disparate plot points throughout the season. I appreciate that effort, despite not being planned in any way.
He's talking to that alien that may or may not still be hiding from him from "Listen"!
Honestly, I could listen to Capaldi reading the phone book. So I don't really care if he's actually speaking TO anyone. I'm still listening.
Well, I do hope he'll do some BF at some point. But the regeneration scene is just too long. I LOVE the name anecdote, which is also, in my mind, the perfect closer to Moff's obsession with the Doctor's name throught his tenure, but it feels pointless, largely, since he's talking to himself. I said it before, but at least One, Six and Eight were alone, by themselves (OK, so Mel was there, but she was unconscious, wasn't she?) and only said very, very few words, since they didn't expect to regenerate, and Ten only even said that he didn't want to die.
I was kinda surprised that we didn't see her in "Twice Upon a Time." I was expecting the 12th Doctor to finally force the 1st Doctor make good on his promise to come back.
I think it might've been a smart twist by Moff if he had 1 tell 12 he half expected to see Susan there, in the Testimony room, then NotBill would show Susan as he remembered her, in the battlefield scene, and he'd then tell her "I
really thought I'd see you there, you know" or something. But yeah, missed opportunity, by any measure.
Also, I kinda wish that the Moment in "Day of the Doctor" had taken the form of Susan instead of Rose. The 50th anniversary special needed some more classic callbacks besides just a Tom Baker cameo & name-dropping the Brigadier.
And the Brigadier keeps getting mentioned anyway, so big whoop on that one. But yeah, it needed more of that. I wish they'd let Ian Chesterton make an actual, physical appearance in the episode. Or had the old Doctors record new lines for the Save Gallifrey scene, to hide the fact we're watching old clips again (though I believe Colin Baker vetoed that idea, or so I heard), or had Benton or Yates present in the UNIT scenes as special advistors that Kate would bring for help, or anything more tanglibly connecting to OldWho. As is, Linkara's got it right: An eight-year celebration of NuWho, with a hint of OldWho and Tom Baker making his last ever appearance. Still good, but not really a 50th anniversary.