I did play the bg tactics mod, if you wanted hard..that made it hard..the enemy would pummel you to pieces and no fight even a small one was a simple event.
Im with you on the options and I believe that comes from AI. The issue is you are trying to out think players but at the same time leave many different playstyles and that is honestly hard.
Yeah, BG2 was very difficult when the enemies started realizing what their ridiculously high level spells did.
I agree, their should be counters and the issue is honestly that every class does just about everything another class does just as well. Damage, buff, debuff..several ways to stun, charm, freeze, slow, weaken, curse etc and not to mention anyone can get a bow and use the spell arrows.