I've taken part in this thread, and it's sister thread, "the most underrated fish". And thinking about it a little more I think it's unfair to call certain species out just because there's something about that particular species of fish that you've taken a dislike to, and then simply lump it with a title of "overrated". In my case, in this thread, I gave rays, arowanas and flowerhorns as my "overrated" fish, and get this, my choices are fish I haven't even kept!! Which, on reflection, made me feel a bit of a plonker!
Many hobbyists love rays, arowanas and flowerhorns, and quite rightly so. All of them in their own right, and justifiably so, play their part in our hobby. It's not really that I think they're overrated, it's more of a case that they just aren't my cup of tea, which is different.
I think it's important to get that across. It's not about underrated or overrated, it's simply down to different preferences and tastes.
ALL species, from mosquito fish right up to arapaima, deserve their place in our hobby.