I would say that it is a majority opinion... I guess that you havn't seen the topic on intelligent fish species. And, good coloration is often a sign of good health and in most cases that's why color is mentioned. A lot of people only buy fish for coloration, but on this "level" of fishkeeping I'd say that most of us do buy fish their personalities rather than color. And the reason that the bowfin just "lurked" was probably that it was trying to keep from being seen. To know the true personality of a fish in aquarium conditions, you need to keep it aquarium conditions. It could just be a local coloration, as all of the specimens in the same size range (36" or so) that I saw while diving in Florida were a solid dark brown, but I have seen some with brilliant orange, green, and red on them.
EDIT: Or as a more simple explanation, when it comes to color they certainly aren't cardinal tetras, but when it comes to intelligence they certainly aren't cardinal tetras either.