I started playing an Avenger (hunting/earth) and he's kicking lots of butt!
I'm at level 14 and so far I have been developing his earth enchantment skill, maxed out Wood Lore, maxed out marskmanship (moving up the skill tree), a few points in Ring of Flame (for when monsters get too close), and when my hunting mastery is high enough I'll also take Call of the Hunt for fighting bosses and/or large groups of monsters.
In Act 3, this build was starting to struggle especially when fighting those (i forgot the names) dragon-like monsters that run on all fours. Anyway, I ended up over-hauling the skill distribution. I took ALL the points form the Earth mastery and maxed out the marksmanship skill tree. I still had a few points left so I invested them into Call of the Hunt which is VERY effective but takes a long time to recharge.