Burst damage is a problem in BG3. Sarth Baretha proves that early on very nicely when she effortlessly one-shots a party member before you even get a turn. Usually difficult combat involves getting party members downed in focus fire before you can act. Or enemies spamming Fireball.

Even so, Larian have only increased everyone's damage output from 5e. Weapons very often have extra elemental damage. Rings add extra damage to attacks. Enemies have all kinds of super powerful multi-attack abilities they can roflstomp you with. Haste gives you extra two attacks instead of just one. Action Surge, Smites and Frenzied Attack were already horrifying in their damage output without Larian's help.

All of this just promotes meta-gaming the encounters and being the first one to get the damage burst in. And it seems like some encounters have been balanced around the fact that players SHOULD metagame them, instead of RP the situations and start the fights in a way that makes narrative sense.

For more fun combat, they should slightly reduce the damage output of both players and enemies. And stop giving all melee enemies jump and teleport abilities to get to the Wizard. Perhaps slightly increase (+1) Armor Classes through gear. As a rule of thumb, every PC should always get at least one turn to be able to react and defend themselves. Always. Except if you're being very careless of course.