They completely changed the weapon. Why didn't they just say, "Haha! We hate our players! And -blam!- any weapon they like!"?
I'm really disappointed, but to be honest, I predicted this(though, not so extreme). It's what I expect from this game and its developers, and why I am smart enough not to buy any more of it.
I hope you all enjoyed it while it lasted, it was a remarkable weapon.
Edit: It's very likely Bungie planned this from the beginning; so many people grinded for so long not only to get HP, but then the 100+ motes to get the perfect roll. That was a substantial hook, and boost to their numbers. They don't respect your time or effort in their game. Really, they are playing you more than you are their game.
Edit2: I agree that it needed a reduction in stability. What this proves, though, is that Bungie has NO respect for your time or effort in a game designed to rely heavily on both of those things. And, that they aren't above, not thinking very highly of you, playing their patrons for fools.
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Over 100 Strikes...over 100 Motes and 300 Weapon Parts...and now? It's still a good weapon, but it was way better before. Not worth all the effort for 3-4weeks of having a really good gun. Bungie can lick my bonghole. I'm going to cancel my preorder.