Sure, they could have made the game better by:
1. Adding more maps to coop split screen.
2. Improving the episode battle mode by removing the slideshow content and getting more deep into the animations.
3. Ranked mode gets unfair at times as most people only pick ultra instinct and fusion characters but other times its really fun and competitive
Everything else I can still live with especially if they keep improving the game with time since it just came out,
Other than that I absolutely love the game and am addicted to it. I really hope that they keep adding content to it to keep it relevant for years to come. I gave 5 stars because it is definitely a must play for any dragon ball fan and anyone who likes fighting games and I don't want the reviews from IGN and GameSpot to bring this game's reputation down just cause Bandai didn't pay them to get a good rating.