Final Bout's soundtrack is the best thing about it.
As someone who actually owned it, it's really clunky; the characters are stiff and the game takes, like, a full second to react to your inputs. It's sort of fun once you figure out how to control the characters, but even that's pretty generous.
Every character has a theme, even the variants (there are 5 Different Gokus, not including Vegito, all of them have an individual theme.
Goku Theme
Super Saiyan Goku Theme
Super Saiyan GT Goku Theme
Super Saiyan 4 Goku Theme (Hero of Heroes)
I think a few of the Goku Themes are deliberately similar, the ones that are completely different are Super Goku and SS4 Goku.
Gohan Theme
Gohan's Theme is really good in this game.
Vegeta Theme
Pan's Theme
Trunks' Theme
Future Trunks' Theme (Hikari no Willpower)
Vegito Theme
There's also the themes for Super GT Trunks, Frieza, Cell and Kid Buu, but at that point I'd just be posting the whole soundtrack.
The title theme is easily the best song in the game.
Though I also enjoy the two ending themes "Kimi o Wasurenai" (I think it means "I won't forget you") and "Thank You".
That smug af Goku on the game cover never gets old lol.