Yeah, Menacing Attack is the best thing in the game for combat. If you land Menacing Attack with the fear effect on any enemy = GG.
It is waaaaaay past broken.
And that's another thing Larian changed from 5e, the Frightened condition. It doesn't make you flee and draw AoO's from everyone in 5e, it only gives you Disadvantage on attacks and saving throws. So you can still fight with Disadvantage or do defensive things but definitely don't get destroyed by free attacks as you flee uncontrollably without even using Disengage in BG3.
