What do we mean by intelligent?

Certainly, they are able to recognize simple verbal commands (Attack names) - somethign that can be done (with dogs). They also seem to be highly empathic, that is, to be able to comfort their trainer when he is distressed. That is not PARTICULARLY exceptional; I've seen much the same from several cats.

I'd say that with some clear exceptions (psychics, dragons), they are mostly animal in terms of basic intelligence, but particularly apt to being taught tricks.