Yes, only ever choke kittens.
My problem with the pregen Warlock is the pregen Wizard. Eldrich blast does an average of 9hp. Magic Missile does and average of 9hp. Witchfire does average 10, Force orb does average 13.
Ok, the debuffs are nice but if a Striker is all about damage infliction...
Don't get me wrong, I like the Warlock class. But as an assassin? Also, the Wizard gets +9 to Stealth checks! Warlock: +0.
I have to admit, I want to get my hands on the rules JUST to create a better Warlock than the Pregen we've been lumped with. This particular one's a little on the weak side. I don't know when I'd use Ray of Frost over Eyebite... sorta useful but...
I'll admit that Curse of the Dark Dream is awesome, though. But to assassinate someone with that you'd have to be really sneaky: target the victim through a window, maybe slide him/her off the edge off the edge of a cliff. But then, with that Stealth skill, getting away is going to be hard, Eyebite and Ray of Frost aren't going to hit all the time.