[Admins]

Well if its just standing there doing nothing then people would easily see that its not a real player. If you see the hologram as enemy on the radar it would still be useful i guess, because the enemy would need to shoot the hologram to see that it is a hologram, it would flicker then.
In some movies (Total Recall?) you see the hologram doing the same things like the one who has placed the hologram, not sure if that would work here. But the hologram could randomly change direction, eventually even move a little bit, kind of like a roboter. The enemy would may be really think that you are a real human and would need some time until he/she realizes that it is a hologram, and then you would come from behind and use your powerful weapons or so, while the enemy is trapped.