I'm really wondering what good mind spike is for, to be honest, other then the few times we get school-locked in pvp.
IN PVE - Trash is pointless, and now that our dots scale with crit and haste, casting a few dots on adds during a fight like Death Whisper, and then mind blasting, flaying, and deathing them is often enough.
In PVP - I will almost always resort to mind flay due to the snaring effect. If someone's trinket or snare removal skill is down, I can push out more damage with mind flay simply because they're movement is hindered which also allows my cooldowns like fear, etc, to pop.
To be honest, i'm more interested in the Shadow Orbs mechanic that we'll be seeing. It'll be interesting to see if they use them as a bit of a resource other then mana to do nifty things.
Can someone explain where Mind Spike would be useful? I'm confused...