User blog comment:MasterCharmander13/Doctor Who:Matt Smith's Top 39 Episodes/@comment-3538016-20140203193028/@comment-3538016-20140203215457

The God Complex, I didn't care for. I wish I could say why. It has all the traits that should endear it to me--neat aliens, impressive characterization, a creepy setting, etc. But I just can't seem to enjoy it fully.

With Time of the Doctor, a part of it makes more sense and shines a light on the Doctor's selflessness. What's his greatest fear? It's not himself, ir the Valeyard, or regeneration, or anything people thought it would be. It was the crack in Amy's wall, terrifying him because of what it could do to the universe. The Doctor sees the bigger picture.