JS:Crysis 3 distills its story down to an identifiable and simple problem – the big bad CELL corporation controls all of the power on the planet, and indentured servitude is pretty much the only way to survive. The alien race called the Ceph take a backseat for a majority of the campaign, which helps Crysis 3 to avoid the pitfalls of Crysis 2, namely that it was hard to know what was going on if you weren't already invested in the series.
This time around, it's simple. A man called Prophet, clad in a powerful Nanosuit, has to help a group of rebels take down CELL for the good of all humanity. It's hardly groundbreaking narrative, but at least it's something practically anyone can identify with.