7. Interrogate To Reveal Enemy Soldier Locations
Almost all of Snake's abilities cross over to the multiplayer arena (minus the detachable rocket fists) - but one that was thoroughly refined in the campaign already was the interrogation mechanic. Rather than being able to choose between finding some hidden items, intel or enemy positions, you don't actually bring up a wheel of dialogue options. Instead, after grabbing an enemy (hold R2/RT with no directions pressed), if you hold L1/LB until a small icon fills up it'll reveal all enemy troops on the field for a short time. This carries across all game modes - meaning it can be thoroughly crippling to your opposition if deployed during a stealthy Cloak and Dagger match. Just be sure not to get shot in the back when you're standing with your target.