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Promethean vision lets you see players who have active camo activated. When running around it's extremely easy to overlook someone using camo if you don't use promethean vision. It also lets you get a jump on players coming around corners or make sure your not going to get ambushed yourself from players hiding in corners.
A list of what PV does: -Allows you to line up your shot before an enemy rounds a corner (PV's greatest perk) -Shows you where the enemy team isn't, allowing you to infer map positioning -Reveals active camo users -Reveal campers (flush 'em out with 'nades!) -Allows you to see whether or not a banked grenade hit the enemy -In large clusters, allows PV allows you to detect enemies...
Plus dozens of more situation uses. It really is the most versatile, crucial armor ability. In my opinion, the only other ability worth using is Jet Pack. You can't argue with the advantage it gives you when you're flanking.