As soon as the "hallucinations" started, I could see where this was going. What was unnerving was seeing the character tell our POV character that it's nothing and certainly not a premonition. Anyone who believes that, well, I've got a bridge on Gallifrey I could sell you...
I do want to know what the full speech was, though. "Almost nothing in the universe can get through a sky trench. Nothing in history has ever gotten through two. Up there, they got 400 of them." Not really scary stuff, unless you count what, at the time, must have seemed to be a serious overreaction to the threat of the Daleks. So why was that speech the thing that scared the new recruits?
Speaking of overreactions, if all it would take would be one Dalek to lay waste to Acadia, why is there a swarm of them? Is this just Time Lord hyperbole to convince new recruits how serious their job is and not to ignore anything? Or, is this a case of the Daleks making a point and showing how they can easily overwhelm the Time Lords? It does make you wonder, if a seemingly unbreachable defense is easily overcome by the Daleks and the Daleks had enough manpower (Dalekpower?) to send that many to take out Arcadia, and the Time Lords had little to nothing in the way of firepower, how did the Time War last so long? Or, is this an example of how out-matched the Time Lord were that they would even consider resurrecting Rassilon? Was it his resurrection that turned the tide and put the Time Lords on equal footing as the Daleks?
I'm trying hard to base my judgment on this minisode on its own merits, since it cannot hold a candle to "The Night of the Doctor," but even if we had gotten this first or "The Night of the Doctor" never existed, this would still have been a weak effort. It really doesn't add anything to our understanding of the Time War, unless you count the Time Lords being complacent and ultimately, having laughable defenses. I wonder if this will have any relevance to "The Day of the Doctor," liek how other minisodes have served as prequels of sorts to certain episodes. I'm thinking of the Doctor destroying the alien ship while calling Amy and Rory in the prequel minisode to "The Doctor, The Widow, and the Wardrobe," where that Christmas special picked up immediately after the events of the minisode. Will "The Day of the Doctor," or at least the part focusing on the Time War pick up immediately after Acadia has been laid to waste?