I think the problem is that it's very one-note yet all over the place at the same time. I actually mind some NCT songs because there's a clear melody that's actually memorable, but Step Back's chorus is forgettable, the bridge is a mess and the verses aren't any better. It feels like a bunch of yelling and shouting over a betha. idk if that made sense but yeah.
I agree that it sounds more like a SuperM song.