They're not pretty, and maybe that's why they disappoint most anglers. I find them to be a nice change of pace, but I don't fish for aesthetics. And these gross fish can fight like bulldogs.
Carp don't really fit this mold despite their homeliness, because fly fishing for carp has become a wildly popular activity. Fly anglers respect carp, but not their slimy, down-mouthed brethren. I'm talking about the unknown suckers and chubs.
I say it's time to love all fishes, pretty and ugly. Judge them not based on their appearance, but on their value as sport fish.