There's "its a new game so we're still figuring stuff out" and then, like basically 90% of all Fusion monsters for the first three years of that game's life there's "wait does anyone over there actually playtest stuff to find out if its fun or not?"
It's also a game where the basis of the ruleset came from about 30 pages of Manga, most of which was devoted to drawing different monsters.
The fact that it's still really popular nearly 20 years later is a testament to something