Underwhelming A5 Wagyu in Osaka (?)

First time Wagyu: had a skewer of A5 Wagyu in Dotonbori street, Osaka (2000 yen). It was from one of the classic stands in the street.

While the Kobe beef I had at another stand was phenomenal, the Wagyu was in my opinion… a bit underwhelming (quite chewy and not that much taste). Just wondering whether it is not my thing, or whether I got “bad” wagyu and should try another piece at another place.

As I understand the meat industry is highly regulated in Japan, so I assume they can’t state A5 if it is not. Could the cooking method be the cause? They are a dedicated stand for Wagyu so I assume they know how to cook it properly

Again, might just not be my thing but would appreciate any input on whether I should try it again. Thank you!!