Board Thread:Metal Gear Solid V/@comment-4913740-20140620093457/@comment-4913740-20140624114745

In Ground Zeroes, A and B ranks are easily obtainable, even with alerts and reflex mode usage. But S-Ranks were pretty much sabotaged automatically once you did either or those or killed somebody. That would be why they're all enraged.

However, like you said, it is a specially-modified mission for the demonstration. I think they lowered the prerequisite score for S-Rank just for the presentation.

People also love reasons to get angry about anything. Before Ground Zeroes came out, there was much outrage about the reflex mode being too OP, or being able to mark and track enemies. I figured those were two clearly necessary features, seeing as a demonstrator got caught even with those features enabled during an early demonstration.