Instead, you should boost lesser weapons to a similar level as the best weapons, thereby giving players an alternative choice. That way you don't piss off all those people who have worked to upgrade a weapon only to find it's now less effective than it was.
Nerfing is NOT POPULAR. And this 2.0 update is making me reconsider whether or not I will be purchasing the next DLC - after all, what's the point if my hard work will be negated by some muppet at Bungie who thinks they are "fixing" the game when they really aren't?