The map, mission door tags, the sound a glowie makes, the map hints when there is one glowie or enemy left. The fact that even in a dense fog, tab targeting works. The ability to right click on someone and see how far away they are. The /loc commands. The chat channels. There are a boatload of information-related "super powers" that can be trivially accessed.
And the most important super sense that every character has:
3rd person perspective, and camera zoom. Think about how awesome it could be if you could peek around corners without exposing yourself. Everyone in Homecoming does it without even thinking.