Smoke Screen is a mandatory, because things like the actives that are supposed to get you out of harms way will randomly change your direction on you and have you tumble back into an enemy if you're not really, really careful. I've found myself using Hungering Arrow, Rapid Fire, Smoke Screen, Preperation, Rain of Vengeance and Turret. That setup, with a little dedication to gear (no, I don't buy from the auction shop) has seen me go through without a worry.
If you could fix the other movement based abilities to not be so bad, then Smoke Screen becomes less important. In fact, I wasn't using it until I found myself struggling as I was trying to use Evasive Fire and Vault and dying a lot, and looked up what others were saying here.
I don't overly care if it IS overpowered as an ability... I don't play to compete with others. I play for my own enjoyment, and it adds to that. If it is going to get a Nerf, then maybe have it make you invisible but unable to attack, and have it quickly restore your hatred. The main time I use it is when I get swamped by champions/elites or my Hatred runs out and I need to recharge it with Hungering Arrow... so I tap SS on and fire away for 4 seconds, then resume using Rapid Fire.