Warlocks need some serious work like every damage skill has to be buffed out the ass to make int builds viable again.
One thing I was looking at is "mastery" buffs. Every class has one and only 3 classes have secondary effects (templars, priests and warlocks)
A secondary effect for each mastery buff could change a lot. I am a big defender fan one of the changes I was thinking was:
Blunt mastery: 20% attack speed increase at lvl 7 (they would swing just as fast as templars do)
Bless Shield: 20% block rate & 15% stun resistance at lvl 7
Rest of the defender skills are just fine no more dual wielding but u get 15% stun resistance which is huge and an additional 20% if you are +10 (and the stun deals magic damage like marea's hammer or strike bash)
This also indirectly buffs dex guards who dont dual wield a buff to invoke could see dex guards making a comeback as well.