...the whole point of Syndrome's speech (at the metatextual level) is that everyone is super and he was wrong for not seeing it. (Mr Incredible was also wrong for not seeing it in Buddy, though.)

Anything can be art. It doesn't have to be appraised as "art" to be art. An audience doesn't have to derive the intended emotions for it to be art. Art is not truly a product; it is a component of the human condition, and we simply box it up for ease of sharing sometimes.