I haven't seen the film. I heard about this and scene a clip on line where Supermans has a smug smile as he easily beasts Steppenwolf.
So, doesn't this beg the question of why you need the Justice League when you have Superman? What is the point of all the other heroes if Superman can single-handidly solve the problem in a few minutes at best?
The other is a common criticism is Superman is overpowered. Unless you have kryptonite or another Kryptonian outnumbering him nothing hurts him. The complaint is there is no suspense in his films and he is even harder to relate to. Doesn't this film only reinforce that idea?
You need the other heroes, because almost the very first thing Superman did when he got to the battle was trust his team to continue the fight while he went off and saved bystanders.