It's definitely a crutch but it doesn't have to be just for the weak, in this case the word crutch is a bad example because even capable people can make good use of it. And any time there's a whole bunch of Orbs on the ground it only makes sense for a Warlock to use their super and generate some orbs of their own, any Warlock that doesn't do this isn't doing as much as they could/should. It's impossible to deny though that the power lends itself to people who die more, and so you're more likely to have people who suck be a Warlock than any other class.