A lot of folks are raving about how awesome and possibly overpowered it is, but they're not taking into account Hell and Inferno. You don't want to be melee range at those difficulties and SH requires you to be. In Normal, and much of Nightmare, you're still pretty durable. But as the mobs start hitting like demi-gods wielding deathstars, you won't want to be close enough to get hit.
It's balance is in the form of its risk factor.
Soul harvest is way too good when its active, and makes WD way to powerfull for a period of time
The bad part about it is that everytime we dont have this spell active we are going to fall behind, you guys sayng you can "avoid" or "choose not" to pick up this spell dont realize that when you are facing higher difficulties you will NOT be able to just skip that amount of int. Plus the fact that its a must have in 99% of the time means we have even less choice of spells
Incorrect. You will easily be able to not use SH. There are plenty of options available to do very good sustainable damage without the use of SH.