Failed in the synergy of the skill.
The fun of it.

If you played the old WW before, you found the synergy of skills (sprint-WW) and resource (i.e.fury generation) matched perfectly.

Now the WW build is like D2. Everything is "automatic". It lacks the fun.
Let me give you few example.
2-piece IK and you will not run short of resource (fury), generally.
You close your eyes and WW and yuo'll find you spawn tornadoes more than sweeping wind-cyclone monk and energy twister Wizard.
You don't sprint any more. You don't need to sprint any more. Use Bul-Khatos 's mighty weapon set.

The whole game play is not quite right. There is no synergy and it's  like playing D1 and D2.

It shows how shallow the current development team is.
Lack of vision. Lack of synergy.
What the current team now is keep boosting damage output.
For example, ancient weapon. You will get 20% damage boost generally.
Keep buffing damage output. Now we see 1-2billions damage per hit.
Blizzard might as well slap 50,000% damage bonus on IK set right in the beginning. Get what I mean?

Now recall back what Blizz did.
Removed synchronisation of sprint & WW. And now they put back sprint-WW and tons of tornadoes but all generated by gears.
Seriously, that feeling sucks. 

Jay Wilson double it.
But the current team sextuple (look at number of tornadoes created).

Jay Wilson was a genius.

Hey everyone,

We're currently working on a hotfix to address an exploit that allows players to gain a significantly larger number of Blood Shards from Blood Thief goblins than intended. While we don't have an ETA to share at this time, we're looking to implement the hotfix (which will also address the underlying bug) as soon as possible in all gameplay regions and will be sure to update this thread once it's live.

With this, we're also in the process of actioning accounts which have been found to be actively using this exploit to gain an unfair advantage. This behavior not only undermines the spirit play, but directly violates our in-game policies for Diablo III. As always, maintaining a stable, safe, and enjoyable online environment for legitimate players is very important to us, and we'll be continuing to keep watch on Battle.net and take additional action as needed.

In the meantime, we encourage everyone to please game responsibly. Not only can using exploits lead to account penalties, but it can also negatively impact the enjoyment of your fellow players. This is why we're working as quickly as we can to fix the underlying issue, and why we'd appreciate your help in keeping the effects of the exploit as minimal as possible until it's removed from the game.

For more information on how to report exploitative behavior, click here. For questions regarding account actions, please refer to Account Administration.

Thank you!