All great art is about the reader/viewer/listener/player, not about the creator.
I agree with this to a large extent, but not quite to the extreme that you seem to be taking it. I think a lot of the beauty and meaning in art, at least as I have experienced it, comes from a sort of dialog that's created between the creator and the reader/viewer/listener/player.
Personally, I can never completely forget that any created work that I interact with was in fact
created by someone; and that knowledge, while it doesn't dominate or determine my experience, always seems to enrich it. Art, for me, is to a large extent about the fact that we're not alone: that there are other people out there, creating things, trying to express things, trying to spread ideas or convey feelings or just make things for the heck of it. That doesn't mean that the meaning of a piece is pre-determined, or that the meaning is even constructed by the creator, but it does mean that the existence of the creator is significant -- at least for me.
The beauty of interactive art, from my standpoint, is that it really opens up the dialog in an explicit way: concedes that the viewer/player really is as much (or more) a part of the dialog as the creator is. We've been saying as much when it comes to literature and other traditional art forms for a long time, but videogames/notgames force the concession to be real (and I find it ironic that so many critics of film and literature etc., who have been espousing the significance of the viewer and the constructed nature of meaning for decades, find it so difficult to accept the idea of interactive artwork).
Oh, and thanks Visiontrick for posting this.