It's a good build to PvP with...though you will run into some problems with builds having cleric as a sub. (Disease, bleed, stun, panic, and death trap go through holyspell)
PvE ...depends on which you do. Solo grind, it's kinda slow. 8/8 pt with others, you can act as a tank or a lock (mainly just for gaining zerk faster for the ints).
Here's Saokill's War / Lock guide:
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