I strongly disagree. It doesn't make it so that you shouldn't use your skills, it makes it so that you need to consider another layer when making decisions about which skills to use and which enemies to engage. The planning when fighting groups (in terms of both positioning and skill use) has the added element of thinking about which of your characters primarily do which type of damage, and which enemies have physical, magical or no armor.Of course you'd say that. ;p Although I don't agree at all. There's nothing really tactical about "don't use any of your abilities, or simply waste them until the fake health bars are gone". This is why the Adept in Mass Effect 2 was awful to play, and they at least had Warp and Warp combos to quickly strip armor. So far, that doesn't exist in this game.
The strongest CC right now is Teleport and Netherswap, with the occasional earth spells (or Spider Legs) for oil. Now imagine a group with 2-3 Rangers that can use those abilities. They blow up casters almost instantly due to the low armor, and for melee they can simply slow them, push them away or teleport (or just go invisible) themselves. The only time direct damage or hard CC (which already fucking requires a multihit combo) spells matter much are against enemies that have no armor to begin with.
In D:OS1, after the start, in most our battles the strategy was "pull them together & nuke them with everything". It's a testament to how well-designed the system was (and is) that the tactical execution of that strategy had so much variety and complexity that it was still rewarding and fun. But in D:OS2, there's also a larger variety in strategy due to the armor system -- at least so far.
Maybe I'll change my mind another few dozen hours in. But I don't think so.