So Broly is the equivalent of a SSJ2 given that Buu Saga/ HS Gohan is around his end of Cell Saga power level confirmed by Majin Vegeta and Goku at the beginning of their duel. So the Z Fighters were just super fucking lucky with the Goku gut punch in the first movie
Me too had it not been for the trauma inflicted on cause of his power and the monster he could and would become in the future. He could’ve at least grownup a somewhat normal saiyan child. Maybe a cool uncle to the boys instead of trying to kill them, ( Goten and Trunks) Also Teen Gohan. I do love how In some fan made mangas he learns to control himself like Bruce and the Hulk/he can control his transform instead of it overtaking him.