I think that it might be a bit unfair to let exotic WEAPONS into PVP. I mean think about it. Using the base assault rifle going up against an exotic. It's a bit unfair. However, I think that maybe they Should be included, but nerfed. That way it's fairer. A cool looking weapon, but with the same power as a classic rifle. Like halo. All weapons are standardized damage and stuff.
[spoiler]let the hate rain[/spoiler]
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It isn't unfair. It's like saying that having the Rocket Launcher or the Sniper Rifle on Halo's MP maps are unfair. Exotic Weapons are like the "Power Weapons" from Halo. They are much more powerful, yes, but they can't be used as much as a standard loadout weapon. I think Bungie mentioned that in one of the Podcasts? That you will have to look around on the map for the limited amounts of Exotic/Heavy Weapon Ammo (this will promote map control)? I'm sure you won't be able to use Heavy Weapons or Exotics at the start of every PvP match, or even if you do, you'll have little Ammo for it. The point of having these Exotics is so that people can choose which of the "Power Weapons" they prefer to use if they get to a "Power Weapon" spawn before others do. Either way, nerfing it is a terrible idea, since it would make the "Exotic" status meaningless.