This one is bolstered by a strong theme.
The official site has a recap here.
What if someone had killed Hitler in the 1930's? Would the world have been better off? I think yes. For one thing, millions of Jews and about as many Pollacks would've been saved. But, of course, the result of a decision is not the only thing that determines its morality. Your reasons and methods also matter. Jesus, as you may recall, had no use for the prayers and alms-giving of the Pharisees because their actions did not match their internal dispositions. Their religiosity was not an expression of their sincere love for God; rather, it was a way to show off.
If someone had murdered Hitler before the outbreak of World War II, I think very few people would've shed tears over it -- and the same goes for the queen in this series. If Snow had successfully shot that arrow through the queen's heart, the fairy tale world would almost certainly have rejoiced -- but what would've happened to Snow in the meantime? Heart of Darkness advances the message that killing someone to satisfy vengeance - even someone as undeniably evil as the queen - is a soul-shattering act. And is this particular message correct? On the fundamentals, yes. If Snow had pulled off her assassination plan, her world would've been spared a future curse -- but she obviously wasn't thinking about that. What drove Snow to the bow was pure selfishness -- and that selfishness would've destroyed her had it been fully indulged.
This episode, I think, was very good, but I am confused about one thing: Why does Emma believe she needs to find more evidence that Mary Margaret has been framed? Wouldn't the fact that the mayor owns a key-chain that opens every door in town be sufficient to establish reasonable doubt? Why not bring the jury over to Mary Margaret's for a little demonstration? Seems a bit convenient for Emma not to use that -- like the writers just want to drag out the drama for as long as possible regardless of whether doing so makes sense.
'Tis an interesting script even with the apparent plot hole noted above. I particularly like how the writers use flashbacks to Prince Charming's fairy tale life to inspire David's suspicions. That was pretty painful.
The performances were solid, but not spectacular.
We don't approve of revenge here at Right Fans, so the episode gets an A- here.