DAI has a few things that can contend for the weakest aspect for me.
Easiest target would be the war table that would have been fine if it wasn't with REAL TIME TIMERS. I guess thats something that I would really not want to see in BG3 cause lord was it frustrating to have to wait 10 minutes to up to like 48 hours (might be remembering wrong and it was 24) just to complete a sidequest. It was wholly unnecessary, and a terrible way to implement an interesting mechanic. SO if BG3 decides to add any management stuff I'd really hope for no real life timers.
Another contender would be Sera I think. It isn't that her personality grates at me, though it does, cause there I could say it isn't for me. Its that her actions seem incongruous with the character she is supposed to be. She is supposed to be a red jenny, competent rogue who takes down the establishment a few pegs. But in her introduction she decides to help you by taking care of a few men that are after you, but instead of IDK TAKING THEIR WEAPONS AND ARMOR, SHE STEALS ONLY THEIR PANTS. Like I would have been fine if the scene didn't change much and she still joked about them being in their knickers, but like if she took the weapons too I'd feel like she is chaotic but competent, not chaotic and stupid. So far, BG3 has completely dodged this issue. Our companions don't feel incompetent, if anything people complain that they don't seem like they should be Level 1 because their personality and story gives off too much competency.
Last thing I could possibly consider the weakest aspect of DAI is that the DLC, other than Tresspasser, wasn't actually that interesting. Which is a sad thing to say cause the premises sound cool like the origin of Lyrium and finding out about the first Inquisitor but like overall the experience was weaker that DAO or DA2 DLC. Lore was there but gameplay and encounters were just not. So far BG3 hasn't been like that, one thing that can be said is it certainly isn't boring (until the 50th barrel explosion).
For me the main plot was actually mostly fine. The opening is certainly the strongest and that is partly cause Corypheus doesn't feel like the overarching threat he should be and so his minions just become fodder to kill. DAO, despite the Archdemon not appearing throughout the game, it felt like he was a threat that was constantly approaching, especially as the map darkened and occasionally you got ambushed as you slept. After the opening DAI plot hits certain beats and gets to good points but overall isn't that strong. Though, probably in the minority for this but,
I really like Solas and The Dread Wolf, I find him to be very interesting and definitely feel like he could be a great villain for the next one if EA doesn't mess the game up (which regardless I will probably get the game used unless it is absolutely free of EAs tampering)
