Though I've not finished the game yet, I did notice that the AI's intelligence and aggressiveness can be controlled in the difficulty option settings... for those saying that it was very silly, what setting were your enemies on (I'm mostly curious because I'm only a little way into my fresh play through now that the game has released)?
I played on Scavenger Mode, which is a step above Authentic and enables the deadlier AI. I am currently doing Cataclysm mode but I don't see a big difference and honestly I kind of just got bored and stopped playing.
Even on just Authentic mode - without the 'deadlier ai'- the enemies should use AOE spells sometimes, or any spells really.
They are. Shaman (orc I guess) used lightning bolt close to every time I see them. And they walked to target more characters, avoiding their friends at the same time.
And ennemies often move in/out your firewall and your spirit guardian, which means that the AI is trying to avoid damages... but the creatures just does not have any tools to range attack.
Would it be a better AI if they were just staying away while you're killing them ? The AI is not the problem. Creatures lack of tools / ranged attack may be one...
What's doing the AI in BG3 when the creatures cannot attack you for any reason ? Slowly dying without moving. Is that because the AI is not smart enough ?
As an exemple, just think about the owlbear when you're going "higher"
On the other hand if every creatures had tools and were smart enough to avoid such spells... These spells would be useless whatever we're talking about Solasta or BG3.
Just like in BG3, the ennemies use the verticality at their advantage with more variation in Solasta, they push you but also prone you, they play with the light, try to kill your characters, try to engage your ranged, use bane, slow and other debuff, use thunderwave a lot (which is less spectacular and OP than in BG3), and so on,...