Anyone that thinks the itemization was better in BG is not worth taking seriously. Wow, +2 fire damage on every hit... so exciting!
+2 fire on every hit means that a) it passes creatures which are physically immune b) it kills trolls c) element damage passes through mage defences, mainly stoneskin, which means that fire damage would interrupt their spellcasting every hit (which is why Fail of Ages was so good, especially with Whirlwind HLA).
Also, +2 damage in AD&D stacks up nicely especially on low levels. That's why bandits with magic arrows with +1d6 fire damage would fuck you up so badly - 6 bandits shooting at the same time means one of your characters eats an additional of 6d6 fire damage which is same damage as fireball does. Concidering average enemy hp in AD&D is very low compared to modern systems, that shit is powerful.
In fact, a simple flame arrow is so powerful, that people were building their theoretical army battles around calculating how many level 1 dudes with some simple magical equipment would it take to beat more dudes or a high level adventurer.
Also, remember that in IE there are no grazes and stuff that turns your elemental lash into 0.3 damage. It's always there and is reliable so if you hit it stacks up. The difference between 18/00 strength and 15 strength is 6 damage. So 2 extra damage is like 1/3 of having best strength in the game without half orc or endgame equipment.
Any caster multiclass with Unbroken with dagger & large shield spec (and it doesn't even have to be Unbroken, plain old fighter will do). Virtually unlimited Concentration, -50% ranged and reflex-targeting damage with extra armour, casting in the front line. They're ridiculously robust ----> completely indestructible with some self-buffs
I was kinda waiting for something that explodes all monsters on the screen honestly. Guess my definition on what is broken is very different. I played mage who wore heavy armor, shield with modal and codex-grimoire who did something similar. Had at most 2 stacks of concentration from items maybe. Blasted everything. Arguably ability to wear tower shields on casters who can press awesome button to explode everything is somewhat too much by itself regardless of dual classing.