Having said that, I do believe i have found a playing style that is both enjoyable, balanced and #%!%s face.
Seriously give this a go, im critting for 2.7k @ early 30's with barely any yellows in nightmare mode. Its probabally not an ideal Boss build, but for farming ect, it works wonders.
Left Click - Poison Dart (Spined Dart Rune) - Mana gain is essential for inbetween the spamming of dire bat. Still does decent dmg on single target (And also a good alternative to spider jar, as the sound just pisses me off)
Right Click - Firebat (Dire Firebat) - MASSIVE damage when coupled with Soul Harvest.
1 - Spirit Walk (Honored Guest / Healing Journey if you are high enough ) - This skill is amazing, pure survability with a heal and a low cooldown.
2 - Soulharvest (Swallow your Soul) - THIS SKILL IS AMAZING. Highly intensifies your damage. You will crit big with this baby if you can get 5 souls proced. The rune for this isnt so important.
3 - Hex ( Hedge Magic ) - This one is not so important. The heal really helps you and your allies and the control helps in nightmare and beyond.
4 - Gargantuan (Restless Giant) - This one is more in handy for solo cases, however he is one tanky bastard that scales very well with gear even in group play.
Passives - Spiritual Attunement / Peirce the Veil / Spirit Vessel
Pierce the Veil + Spirit Vessel are immensely useful for the crit + survivability you need to enhance this build.
Seriously give this combo a try if you're stuck, it works well for me.