Ey m8 Imho something needs to be done to the Decoy nades, the stationary enemy marker it makes on the mini map only works as a decoy the first time you see it, after that it only makes you aware that there are an Infiltrator in the area. My 5 cents for a solution Make the enemy marker on the minimap blink on and off(for the duration of the nade), and prehaps make the marker on the mini map move a bit. But btw what are your experince with them?
Nothing says 'Infilitrator here' quite like either the cloak sound, a rifle shot or a decoy grenade. My experience is that it basically alerts enemies to use their infra-red/NV scopes which as we all know, is instant-death for Cloakers.
Decoy grenades should bounce and roll around as they're creating those false positives. Give a sense of movement.