This game is 50% TV show, 35% filler, 15% actual gameplay.
The best and worst part about this game is how it directly follows the tv show. On the positive side, its fun to play through the story. On the negative, they didn't want to add anything meaningful that wasn't in the show, but also don't want you to beat the game in a few hours, so the end result is a quantity over quality approach that leaves you literally running pointless errands as "missions".
Most of this game consists of fighting a ~2 minute battle, followed by countless cut scenes, loading screens and "movies". Even with skipping and fast-forwarding whenever possible you still end up waiting 5+ minutes at times before actual being able to do anything.
Player levels are basically meaningless. Each character automatically levels up accordingly with the story. You'll be level 20 one moment then a few consecutive cut scenes later you'll be level 27, goku will turn super saiyan vs frieza, ss3 against buu, etc. regardless of what you do in the "open world"..
The "open world" consists of ~12 separate areas that you constantly have to load between. For a 2020 release date game it almost feels intentionally lazy to artificially inflate the gameplay time.
Overall the game isn't terrible, but it would be much better off if they focused less on making an "open world" and random time fillers, and more on allowing you to actually play/fight the story as opposed to essentially re-watching 90% the show with the occasional quick fight.