Combat in those old IE games was pretty bad. I finished both BG games a few times on the hardest difficulty soloing with my op builds. Normal encounters were ridiculously easy and not a challenge at all. Then you have prepared boss fights with 10 prebuffs, 10 potions with dispelling enemy buffs or waiting for them to wear off and destroy them i 3 seconds.
I find funny all those "IE VETERANS" who prefer BG combat because clearly they don't prefer it for balance but because how easy it was to make op characters and "feel powerfull". Yes PoE is not perfect, but it's miles ahead of IE combat even now with those silly bugs.