This isn't that bad as a little trailer thing. It's sad, and shows the Doctor mourning Amy. It's certainly more interesting than anything in the actual runtime of The Doctor, The Widow and The Wardrobe. It looks decent to acceptable enough for a little prequel still up on Youtube. And it was nice to see a bit of Matt Smith being Matt Smith again. I don't think this deserves much criticism other than acknowledging that it is very weird this wasn't in the original episode to begin with, which is a big compliment to the prequel itself, if you ask me.

The minisodes do what they need too

Phenomenal hype building. 0 to 60 in 90 seconds.