I like using feats and use them a lot in actual dnd.
In BG3 I'm using them less often as some powerful ones are missing or nerfed, but there are still a few that can be worth using:
- weapon master on Astarion so he can use heavy crossbows
- magic initiate: warlock to get hex on characters that can hit multiple times per turn
- moderately armoured on warlocks or rogues
Some early game feats that I like to use in DnD that are not in BG3 yet:
- lucky, which allows you to reroll a skill check, saving throw or attack roll 3 times per day (in DnD you can't use inspiration to reroll)
- healer, which allows you to get a character who is making death saves back on his feet (currently everyone can do that without a feat, and unlike the feat you don't even need to use a healers kit consumable)
- inspiring leader, which allows you to give everyone temporary HP
- polearm master, which gets you opportunity attacks against enemies that enter your reach as well as allowing you to use your bonus action to attack with the blunt end of your weapon
- sentinel, which allows you use opportunity attacks even when the enemy uses disengage and if you hit someone with an opportunity attack, they can't move for the rest of the turn
- sharpshooter, which allows you to use the full distance of your ranged weapon without disadvantage (e.g. 400ft for a heavy crossbow, 600ft for a long bow) as well as ignoring partial cover (which doesn't really exist in BG3)
- spell sniper, which doubles the range of all spells that involve an attack roll, allows you to ignore partial cover and allows you to learn an attack cantrip from any class
- war caster, which allows you to cast spells while you have a weapon or shield in both of your hands (currently everyone can do that without a feat), gets you advantage on concentration saving throws and allows you to cast spells as opportunity attack
