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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I trust Bungie knows what their doing. Im thinking that most weapons will be well balanced in time it takes to kill someone. Probably the exotic thing about the weapon is not only the case but how it goes about that time. Like the Thunderlord shooting lighting rounds.