Prediction time! I hate to say this because I'm a big DBZ fan, but I think this game will be shit. Judging from everything I seen so far, the gameplay is going to be shallow mashing the same button over and over again like a quicktime event. The hub world is going to be mostly big but empty, the side quests are going to be boring fetch items repeatedly, crossing these large hub areas enough and it's going to be as familiar as Xenoverse 2.
The mini games look boring too, and probably won't hold your attention longer than 5 minutes, after all how long did you fish in FFXV? The cutscenes are choppy and I much rather watch the anime itself. Many areas like Snakeway or Otherworld are cutscenes only, which means no exploring those areas, kinda lacking for an RPG.
There's no incentive to replay this more than once, I heard people say this game is over 100 hours, but who wants to waste 100 hours fishing, driving a car which is probably as linear as FFXV, or fighting a bunch of npc bots to collect a quest item? I bet speedrunners can probably beat this game in 6 hours in story mode. Sorry for being a downer but this my opinion from the game so far, I really do hope I'm wrong about all this, but I don't think I am.