For looks, hummingbirds win. But far more than blue jays, hummingbirds are dicks. If they weren't the smallest birds on the planet, they'd be terror-inducing. And yes, you can find pictures of hummingbirds that killed each other (corpses impaled on each others' bills), so yeah, they can be just insanely violent. Woodpeckers convey the impression of not being very bright (they do slam their heads into trees all day) but I don't see what I can interpret as orneriness in the behavior I've witnessed.
And actually, barring the agricultural damage they do, crows are actually pretty cool. Admittedly we leave them stuff (old cat food, chip crumbs, etc.), but the ones around us recognize us and are pretty tolerant. I haven't seen what I can call clear unambiguous affection, but I don't mind them at all. Blue jays are just dumber than crows: they come to a source of food, spend half a minute yelling loudly and boasting of their discovery, by which time something else has come in and dispossessed them. They really are the dumb blondes of the corvids. (Most of the really stupid posts on Twitter can be thought of as coming from blue jays in human form.)
But the most obnoxious are robins. Those idiots start calling loudly about 4AM here (and it's still full dark then, even here) and keep going until well past sunrise.
Robins vs Pigeons