I would be more into the camp of RNGless CC is bullshit. 100% chance to apply CC, no defense what-so-ever... it's insane. Have you tried how easy it is to CC opponents in D:OS2? With 100% chance to do so, there's literally "STUNLOCK ME" written on all opponents. I hardly find that emergant gameplay. Why do damage if you can just permanently take them out of the game, no questions asked.
It's only %100 percent if you've worked through their armor (or they don't have any). I've experienced needing to backstab twice (w/ guerilla) on some mobs just to take down their armor so that that can be CC'd. Granted, this isn't the case for most mobs in Chapter 1, but considering we're basically playing an extended tutorial I don't see how it's an issue.
Keep in mind that players are subjectable to the same rules. On my play through with four people, I've had a couple of encounters so far where I've been CC'd pretty hard. So fights often come down to "Focus this guy down, CC that guy" or even "Focus and CC that guy". I have found the AI to employ the same strategy with some success. I can imagine things being quite a bit more stressful in tactician mode, which has always been where DOS's difficulty has been.