I've played around 40 hours across a couple of characters, and have gotten nearly to the end of the EA with my Warlock. My two cents are as follows:
Firstly, I enjoy the game, and I think that it's got a lot of promise. It's unclear what issues that we're seeing now are because we're in Early Access, rather than because of design philosophies of Larian. So the pile of complaints below comes from a place of wanting good things to be better.
Variant Human should be a higher priority to include in the game, not only because it's incredibly popular, but also because given the issues that have been found with feats (Dual Wielder apparently doesn't work?), testing to make sure that someone with two feats works (before level 8) seems important. Never mind that the default human is boring and terribly optimized.
I know it's coming, but I really want to play a Warlock multiclassed with Paladin. That is, assuming that we also get Hexblade Warlock (another incredibly popular choice that it would be nice to get confirmation on).
Surface Spam trivializes combat, and makes a mockery of the normal balance of the game. Similarly, Fire Bolt (and all other fire effects) automatically giving the burning condition trivializes both Shield of Faith and Mage Armor. Why can't we make a dex save to avoid getting lit on fire? The defensive spells that buff AC are supposed to protect you from getting hit, so that when something misses, you don't have to make a concentration save. Everything and everyone on fire stops being a game about positioning, resource management, and tactics, and becomes Donkey Kong throwing barrels everywhere. This leads to the next problem: HP Bloat.
Changing the AC and HP of enemies to make combat "feel better" is the rumour that I've heard. It seems more likely that the absurd amount of free status effects and extra explosive barrels around that damaged with no save allowed meant that low HP goblins would be gibbed by two Characters using Fire Bolt.
I have the same complaints about AI Pathing as everyone else. I got to the room of exploding mushrooms, but had seen one explode while climbing down the cliff in the Underdark. My character carefully avoided getting anywhere near any of them. The rest of the party cheerfully detonated the room. I was also playing a Drow. Why didn't I get some kind of "you grew up here" bonus to announce that the mushrooms were dangerous, instead of having the whole team fail nature?
Why is "passive" perception a roll? It's supposed to be a flat number to notice things. Investigation is supposed to be the active effect to find specific details. The game could benefit a lot from the "Take 10/Take 20" rules from earlier editions of D&D. And again, the party should not traipse over spotted traps. Having an active investigation option would also be highly useful. I agree that searching through dozens of empty crates is highly tedious, but the game already has a skill that is supposed to help find things. Have perception and/or investigation highlight which boxes/things have loot in them. Hell, have it tied to the ALT button that is supposed to show all of the objects you can interact with. Thieves Tools and Trap Disarm Kits (why two things?) being a consumable item, rather than just part of your gear is very strange to me. Having rope, the single most important piece of gear in a low level party be relegated to vendor trash feels like blasphemy.
Why can't we climb? Jumping around like a jackrabbit in combat is fine, but having the Athletics Skill, and rope be worthless isn't? I won't go into the Jump/Disengage thing too much, suffice to say that they should be two separate things, and neither of them should be a bonus action (except for rogues, who are supposed to get disengage as a bonus action to differentiate them from other classes).
Speaking of class balance and differentiation, there doesn't seem to be any. Or at least, stealth is free and easy for everyone, regardless of skill or amount of armour. Melee tanks don't exist because you can't take sentinel (really want variant human again) and disengage is free for everyone. Kiting and abusing the AI with stealth lets you literally solo the entire game. I'm sure that there are AI fixes coming, but some comment on the issue would be nice. Wizards can learn divine spells from scrolls, and worse, food is as powerful as health potions. Not that there is any indication of that. I had no idea that eating food would heal me, and had sold entire grocery stores worth of produce that would have instead been gorged upon. Also, assassinating something from stealth that is sleeping (coup de grace) somehow breaks stealth, and alerts the entire world that something has happened.
So Rogues have no reason to exist, since they can't assassinate things properly, and stealth is free for everyone with no real need for dexterity, or skill checks at all. Clerics are pointless since we can eat the whole countryside instead of casting a healing spell, tanks can't do anything since everything disengages for free, and so we're left with Warlocks and Wizards being king, since they can Firebolt and Eldritch blast everything while jumping in and out of stealth, or just detonating the whole world at range. Bows are supposed to have varying ranges. Spells are supposed to have varying ranges. Allies are not supposed to block movement, it's supposed to be hard to move through enemy squares (that's what acrobatics is for).
Speaking of bows. Equipment options at character creation should be a thing. I wanted to make a dual wielding Drow Rogue who used a Rapier and a Hand-Crossbow, only to find out that you can't get hand crossbows until 75% of the way through the EA content. I'd like to be able to pick the weapons and armour for my character at the start of the game, just like every single D&D game in the entire world.
The evil options feel like playing a cartoonish "that guy" edgelord. There was no point where I felt compelled, tempted, or even coerced into working with the goblins. The reaction to being a Drow was cool, and getting to mess around because of that is neat. But it would also have meant that, if I had been so inclined, that I could stack every single explosive I could find around key enemies, and bypassed entire encounters. Hell, even Karga, who is supposed to be "not evil, just trying to protect her people" kills a child right in front of you as your very first interaction. I understand that Larian is supposedly supposed to be good at writing characters, but if that's how they portray evil and neutral, then I've got deeper concerns.
