User blog comment:Fliu/Chapter 930: Germa Sanji/@comment-25654036-20190118160724/@comment-24850639-20190122182812

It's just bias. People have a natural tendency to view Zoan fruits as the least impressive because they tend to simply allow one to transform and boost stats rather than grant them control of some kind of substance or force. On the same token, people enjoy the Mythical Zoans that have been shown so far because they DO grant additional abilities aside from transforming and boosting base stats. Marco can heal/regenerate, and has some degree of pyrokinesis. Catarina Devon can perfectly copy people's appearances at will. Sengoku could create shockwaves.

In addition to this, the Awakened Zoans we've seen so far - the Impel Down Jailers, didn't exactly leave the best impression. While I do think Zoan users are naturally better fighters than other fruit types due to not being able to rely on substances or forces of nature in a hand-to-hand scenario, it's not as a flashy, and thus not as appealing. I get what you're saying though, at this point it seems a little silly for anyone underneath the rank of All-Star to have a mythical fruit if Kaido is gonna be the only other person in the crew with one.