Focus on Goku was always Toei's thing; in a lot of their anime, like Saint Seiya, Sailor Moon, Precure, etc., they always set it up that in the end main main character always get the last shot, even if they aren't the strongest.
It is one of the reason why there are a lot of people who more prefer characters like Vegeta (who is actually much better character than Goku), Gohan, or Piccolo, or even Trunks...
Super, while having its problems, in the end ended up very good shonen, and introduced a lot of interesting characters, and some cool concepts, but Goku in it was absolutely terrible, like he regressed to his child self, while still being a grown up man.
That being said, after seeing the gameplay, and the world map thing, I guess it isn't thaaaaaat bad, because of sidequests, but still, it isn't all that different either.
Dragon Ball Z: Budokai 3 game that I played on PS2 had a very simple, yet good world map where you have for multiple characters events, battles, and items to see/pick up, and I do think that map was better than this one.