I've seen a few performances here, most recently the full operatic performance of Aida, and of less grandiosity, but equal charm, Corb Lund and the Hurtin' Albertans.
I've been to few theatres around the world, and while "The Jubilee" is not equal to say, the Lincoln Centre, I do feel that Calgary is pretty lucky to have such a well-designed, reasonably aesthetic venue. The sightlines are quite good, and as other people say, the acoustics are pleasing.