1. Wizards continue to be able to learn any spell (Divine, Bard, Cantrips) from scrolls. I have a higher tolerance for homebrew than most - but something like this is class-identity destroying.
2. The overall story and setting is incoherent and falls apart in Acts 2 and 3. The plot hooks placed in Act 1 are not resolved in a satisfying manner.
3. Companion party lock, especially done in a manner that doesn't serve gameplay or story (i.e. DOS2). I'm okay with losing some companions because of my decisions, but not because they didn't happen to be in my party at the exact time some random meteors came by and suddenly I lose the ability to rez them.
4. Mechanics unbalanced in a way that isn't FUN. I.e. I'm okay with some deviations from 5E RAW, but if somethings continue to be broken and universally beneficial for everyone like BA Hide + Stealth - that just becomes a tax.
5. Loot/Progression mechanics breaking the system. This kind of happened with the end game of Solasta and I can easily see it happening in BG3 to an even more extreme extent. Shiny loot is definitely fun, but I don't want it to completely trivialize the game - i.e. being completely untouchable by the end game because of some very basic stacking and optimization.
Edited: and most importantly... throwing grease on your characters doesn't make them slick and shiny
