The only thing I don't like about them is the flavor, in that it seems like it kind of IS evil to use source, since there is not much lying around in a "natural state", so using it with any frequency requires sucking out people's souls... and yet, even that sounds evil, but has no impact on the game, seemingly. Natural source being like "water" lying around feels hokey too.
As for the skills themselves, and not "liking" them, if from the perspective that they are too weak, nope, they are plenty powerful. Steam Lance and Infect do kind of suck, but the rest are pretty great. In my first playthrough I beat the act boss without even realizing that's what it was (I thought there'd be one more fight leaving the area, so to speak to say it vaguely without spoilers). I didn't even have help from a certain NPC I accessed after the fact just to clear the map.
Laying down Infectious Flame and Chain Lightning basically filled the whole battlefield with nasty cursed floors that kept propagating outward from other effects, while I kept the high ground and mostly avoided them. It was sad, actually. But, no one wants to talk of nerfing anything, and I'm sure honour mode will be so deadly no one will complain about their own skills being OP.
This is the problem with a game like this, the experiences that people have vary so wildly, and even the same person can experience such different results on different playthroughs, that "balance" is virtually impossible. The same skill one person might find overpowered or use with great success, another person might find useless or hard to implement effectively.
