Sadly, I also get the impression that cardinals are extremely stupid. All looks and no brains. Ours sits forever on the edge of the feeder, seemingly contemplating his navel, supposing he had one, as if he's forgotten what he's there for and hogging the space, which annoys the other birds.
The cardinals' song, such as it is, is also extremely tedious, especially when they insist on perching right under our bedroom window. They are irritatingly early risers and more than once, I've woken up to hubby leaning out at 3.30 am yelling, "BUZZ OFF!"
The cardinal's wife is a much duller colour, which is the avian way and given to dashing her head against window panes over and over again. Last summer, she built a nest in the most inconvenient place possible, just above where I turn the garden hose on and off. Every time I tried to reach it, she would fly off in a frenzy of squawking. But instead of finding somewhere more suitable, she always came back again.