What's the most shockng thing about XCOM 2?

It's got a good yarn. The aliens aren't just a paramilitary threat anymore and their motives aren't  resigned to some some throwaway lines at the end of the game about them finding the perfect warrior.

There's a mystery at the heart of XCOM 2 that's way more intricate than Advent simply processing humanity into food. The dialogue can be hammy and the performances don't always hit (Shen sounds pretty sleepy sometimes) but the act of freeing earth takes scientists and engineers. Not just better guns and soldiers. There's some half decent drama to be found hacking away at alien corpses in the lab, surprisingly.

Advent is a puzzle just as much as it is an enemy. In other words, the last thing I thought I'd find compelling about XCOM 2 was it's story.