Fighters have a lot of interesting stuff going on in 5e. They can be weapon masters with unique moves, they have great control over enemy movement, and they can give all sorts of buffs and bonuses to their teammates.
Unfortunately, in BG3 so far they've massively buffed even the most basic spells to apply powerful debuffs and crowd control effects, and warriors are very much second rate in comparison
That can change with balancing, though, and hopefully it will
