Classic is fine I am about second half of Act 2 and yeah they hit hard, but the trick is before you engage is to take decent position spread in difficult to reach areas with height advantage where possible.
Also the tactic where you send tank as a bait to take that initial burst works well too.
Also when you talk and you are about to take a kill all shit dialogue or it goes that way (pretty obvious in most cases), you can still select rest of the party members and spread them around, heck you can even initiate yourself - get full AoE magical combo nuke in the juiciest clump while NPCs talk to your tank with something like "hurr durr u gonna die now!".
Basically if you survive the initial round with good results you can probably already CC the biggest nuisances and then shut them down. The rest you can teleport to Africa and if you chose good destination it will take them 2-3 turns to even become relevant.
Of course sometimes retarded shit happens, but really just with above you pretty much have 90% success rate spoiled only by something ridiculous like assassin with adrenaline teleporting and twoshotting some clothie.
Thread is about TACTICIAN, learn to read.