Rate "The Girl Who Died"

We're already up to our fifth episode of the new series, and we begin yet another two part story. Here's your brief:

"There’s going to be a war tomorrow. And here’s some news, this just in – we are going to win the hell out it!"

In a backwater of history, in a little Viking village where all the warriors have just been slaughtered, a young girl called Ashildr is about to make a desperate mistake. The Mire are the deadliest mercenaries in the galaxy, famed for being unstoppable and without mercy - and Ashildr has just declared war on them. The Doctor and Clara have twelve hours, to turn a handful of farmers and blacksmiths into a fighting force ready to face down Odin himself. And there’s more - because this is the day when the Doctor remembers where he’s seen his own face before.
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Where he's seen his face before? And am I the only one who thinks, from the teaser commercials, the Mire seem a bit Judoon-like? Well, at any rate, here's your chance to let us know what you think of this week's entry. And the standard spoiler alert applies: This thread will remain locked until UK transmission of the story. So if you're outside the UK, and you wonder in here before it's shown in your area, you run the risk of being spoilered. Don't say you weren't warned.

So, I need to understand this: is Ashildr the new Captain Jack?

Wonderful story, very clever way to fight a war, but that ending sort of jarred me. 4/5