This series made a tradition of doing them and doing them well. And for me, they often added to the mystery. They didn't solve the puzzle so much as showed you the pieces out of order. Just go look at the dozens of crazy ass (and wrong) theories on the internet regarding what viewers were expecting, doesn't seem like too much got spoiled to me

Plus, the finale moved at a really nice pace I thought, partly because it had less ground to cover thanks to the flash forwards.