Standard plot of DBZ: "This is the strongest opponent we've ever faced." *get strong enough to beat them* (a few episodes later) "Ok, THIS is the strongest opponent we've ever faced." *rinse and repeat*. Using this guide, Goten.I never thought I'd get this much use out of this line.
Despite it only being a few seconds, Goten wasable to hold his own against Broly of all people, mind you even Bio Broly would crush anyone in the Naruto verse. Goten showed some power going blow for blow with him. I wonder if he had not been injured prior to the point he went rage mode, he may have given Broly an even better fight. Goten could tank a blast from 4 tails, and counter with a moon buster eaily!