Yeah, goat is right that with cloak, Crysis becomes way too easy. That's how I pretty much beat Crysis on Delta too, used cloak, switched to armor for the second I shot someone and then back to cloak. If I had to kill more than one NPC, I just switched to armor used speed, went behind some rock etc. and switched back to cloak, it's pretty easy that way. It would be cooler if some NPCes had some heat censors or something so they could know where you are even if you are in cloak mode. Or that they would notice you easier when you are close to them and so on. Anyway, I don't mind it too much because you can play the game the way you want to and especially in Warhead there are moments when cloaking doesn't really do that much good.