To Hotlunch's credit, she didn't immediately chalk up the blame to overpowered Warlocks but, probably rightly, to her gear. It's pretty true that poorly geared Rogues aren't much trouble to your well geared Warlock. As long as you have the hp and armor to last through their barrage of stuns to get off a fear and trinket out of Crippling Poison, then kite them around while they burn through Cloak of Shadows and Cheat Death, they're pretty easy. It's when you get the well geared rogues with tons of armor penetration and resilience that you start feeling the sting of those blades.
Of course, some people in the thread rightfully pointed out that she should start looking at Opportunist's Battlegear for a quick leg up on PvP gear - it seems like her situation is exactly what it was implemented to help out with, and might have helped out a bit with the Felguard. Good luck to Hotlunch on getting geared up. With a little more preparation, I'm sure the next AFK Warlock won't be so lucky.
But thinking about the situation, I think it's also a good counter to those people who get caught in complaining about "welfare epics" and all that.