BG3 combats are often frustrating, are too easy and/or too hard depending if you're using "Larian's creativity" or if you're thinking "inside Larian's box", are repetitive because they always require to use the same tactics and they aren't balanced or tactical at all.
This is NOT because of D&D. Keep that in mind and if you don't believe me... try Solasta (and close your eyes during cutscenes^^).
Combats in this game probably aren't perfect for a wider audience but it's far better than what we have in BG3... and this is because of D&D.
So now you're agreeing with me that the game has serious balance issues that need to be addressed urgently? I've never played D&D, apart from NVN twenty odd years ago but I don't remember combat being as unfun as it is in BG3. Every time I've complained about the balance issues the line trotted out is "it's adhering to D&D rules" which is why I said what I said. Where the blame lies doesn't really concern me, so long as it gets fixed. I can give you another two examples of the serious imbalance of the game.
In this first example, I'll ask you a question: Should a Goblin be able to push a troll off a ledge when I can't push a worg off one?
In a fight I had earlier today this happened, I tried every pushback spell and ability and nothing would dislodge that Worg, but a 3 foot Goblin was able to push a 3 meter troll off on its first go.
In the second example, using Lae'zel I sneaked past the guards, came up behind a Goblin still hidden and had a low percentage (25% I think it was) to hit. Predictably I missed. This is why I made the quip about fighting Jedi Masters. Do Goblins have preternatural reflexes? Do they have eyes in the back of their heads? Standing behind someone unnoticed should convey a 100% hit chance so I don't want to hear any more rubbish about tactics because even when you use tactics the game punishes you for it.
For Spellcasters the constant missing is compounded by the fact you only get to cast one rank two spell per rest period because not even short rests regenerate that, they don't even fully heal you, they only do a percentage. This makes being a Wizard that you really don't want close enough to be using melee, a total waste of a character slot. This is why every other cRPG in the last twenty years has used a resource like Mana that can be replenished with the use of potions, and have different spells use different percentages. Would that be in line with D&D? Probably not but only your enthusiasts will care, your average gamer will not. Whatever mechanic is used, spellcasters must be able to cast more than one high level spell per rest period, and short rests should regenerate it.
The bottom line is as you say, BG3 combat is not fun, not even close, and this needs to be urgently addressed and the focus of the next patch before any consideration is given to more classes or story.