It's less single target damage than EF... 115% vs 125%, and take covering fire to guarantee three hits every shot against a group.
It's not ****. I'm using it fine within my build Act 4 hell, as are others using it into inferno, and it's not even come close to causing me problems. If it's burning through discipline that much because you're not leaving space, then obviously it's not going to be the skill for you.
Not working with your build and play style doesn't make a skill ****.
Hungering Arrow has a chance to pierce for another 115% weapon damage, and afaik can pierce again for even more. And seeing as all you'll be doing is kiting, you'll be using Nether Tentacles as your main damage ability, not Evasive Fire.
Act 4 Hell is completely different Inferno, especially Inferno Act 2 onwards. You can't compare the two. It's not a matter of not leaving space, but rather the fact that you can't just sit at range and pump away indefinitely in Inferno, if enemies are getting close you need to use your discipline to get away otherwise you're dead, the backflip from EF is useless *when compared with* SS which is absolutely necessary and you need to save your discipline for that, not backflipping.
It has nothing to with my playstyle, it's a fact. That's just the way the game works. Yes, it may work for you pre-Inferno and I'd like to see these people using it post-Act 1 Inferno because I'm genuinely curious as to how to would even be viable in the 1-hit madness that it is. Does EF break snares/roots? If it doesn't, then what's the point? Does EF's backflip follow your cursor or does it take you just backwards - in which case, Vault with Tumble would be much better as you can better direct your movement.
The extra 1 hatred is not enough to make it better than Hungering Arrow, which does more damage due to it piercing. And you won't be using it on multiple enemies when you have Nether Tentacles which passes through all of them and sometimes hits twice.
Unfortunately Inferno is a different ballgame to Hell and lower. I was happily plugging away my Bola Shots until it became very apparent that they weren't doing enough damage and that as a Demon Hunter in Inferno all you need to focus on is how much damage you can do, how quickly you can do it and if you can SS away - the last part is key - if you waste discipline on backflipping randomly when enemies get near, you're dead.