I only used Gus' definition of art because I feel he is the foremost authority on art around these parts. However I do feel games are a form of art. Yes there are a lot of shitty games out there that dont lend themselves to that argument but the same could be said about painting and books and music. Namely your grindcore bs.
(Just a small jab there, no offense) On the other hand there are lots of paintings and books and music out there that do fortify those mediums as art and that side of games is smaller in proportion to the shitty ones, hence the debate. I think Gus pins down and defines art as best as anyone can, because like he himself said its just semantics, but I feel he is mostly comparing games to paintings where I think they are more like movies and/or books. Then again one could argue that in creating a game its more like a painting where enjoying it is more like movies or books.