It was actually a bug fix. The ring's proc damage was incorrectly scaling with a player's primary stats and weapon damage, which it was never designed to do. While we agree it was pretty sweet to see your characters do millions of damage in a single hit, no other Legendary procs scale this way -- and that's intended.
The Hellfire Ring will still be valuable, though. It may not be as valuable to players who have reached Paragon 100 now that it doesn't deal buttloads of damage when it procs, but it will still be competitive. Given the nature of how the ring is crafted, it has the opportunity to roll with some pretty incredible stats, so one of the rings you create may be BiS for you. Then again, it may not, but that's a good reason to keep farming (if that's your thing).
As for players who are leveling Paragon, we're okay with Hellfire being BiS. Yes, it will help you level up faster, but even if you stack it with Leoric's Signet and a ruby gem in your helm, reaching 100 will still take a very long time. And, as you've illustrated, the ring probably won't be a "must-have" forever, at least not for everyone depending on the stats you roll.
I.E. what this guy said:
The Hellfire Ring can still be BiS, now you just need to rolls to do so. You already have High main stat....you just need the 4 randoms to roll trifecta. It will now take a LOT of farming to get BIS hellfire ring.
Sadly to hear that. I still think the Hellfire ring is the best thing of 1.0.5, including the whole quest to make it. But nerf it (or fix it if you like) in this way is not a very clever move, like all your other class skills changes, simply fix the damage or decrease the chance of some ability may leave a bad feeling to players: you guys are absent-minded with class balance and bug fix.
I think there could be more ways to make it very human. Like the whole Hellfire ring things, all you don't want to see is "characters do millions of damage in a single hit, no other Legendary procs scale this way", but it's still a very important reward of your first legendary quest, so how to balance it, not very imba but still very attractive, that's the problem. Nerf the damage is OK, but we can find some more attractive points to seduce players make it. I have some suggestions maybe can give you some hints.
1.The Hellfire Ring has four random attributes, considering the great damage of fire ball it was OK in the past but now it is not OK as fire ball sucks and other legendary rings have more random attributes. I'm playing a WD so I need vitality, resistance to all elements, hit adds life, critical hit chance, critical hit damage and so on. Four random attributes are far more enough, maybe you can give us 5-7 and that will represent the value of the ring and also make players to do the task again and again.
2.Maybe you think 5-7 random attributes+fire ball are IMBA, you may consider to give some special attributes like damage convert to life, movement speed, pick up yards, damage against elites and so on, that other rings don't have chance to make it. Even more give some classic rewards like more mana or rage, or some classic skill reinforcement like reduce CD or something but the ring should be better made in hero classes. We can call it "Hellfire - Condemnation Of Unformed Land" or "Hellfire - Vengeance Of Night Stalker" and so on。 That's really cooooooool.
3.Maybe you think both solutions are not appropriate, we can deal something cool with the +35% EXP things. Like heirlooms in WOW, the ring is bind with account, we can give it to some other characters to easy-levelup.We can also set a formula to control the value of attributes (including random attributes). For example, the ring has 180 int, when you in level 1 it become 3 int. I think it's not a very hard thing.
In a word, make it special and attractive.
Thank you guys for all you have done to the game, great job!!