Man, DA:O is very casual even on nightmare its a walk in the park as almost all "rpgs" nowdays. there is no tactic there.
KoA and DS3 -yawn.. some ppl may find the games amusing but tactical? nope
dark souls games: thats more like it in the terms of hardness/unforgivness not very tactical but very reactive.
baldurs gate 2 with a hell loads of mods including tactics, harder fights, impossible boss fights etc now thats the most tactic u can get
(this rely on have the right set of mods to balance gimp and make things harder but thats the way to go)
POE will be in the same genre as BG and with the different settings (hardcore etc) im sure u can tailor the game to be tactically challanging and that the game will utterly destroy DA:O in the terms of gameplay, combat, classes, skills, strategy, replayability, immersion, graphics, yada yada..
i need some gamma gulp beer..