There's just too many of these 'wagyu'-based dishes all around now and most of the time, these are quite seasoned enough that you don't really taste or feel the wagyu quality anymore. This also applies to instances where you see 'A1 grade' beef or the like on the menu and the dish in question is something that is heavily seasoned.
Now don't get me wrong, I love wagyu beef but just as the plain steak itself. And yes, I do think the premium price for wagyu beef is justified but only if it's served as steak. For dishes claiming to have 'wagyu beef', I feel it's all just a scam - not that different from the whole 'organic' food movement that most of the time just makes the food expensive than it should be.