Games being considered art is the reason why there are six hour video essays on games that took less than half an hour to beat. This is also why you hear the word 'content' so much when talking about a game and the rise of interactive movie games, anything to make it less than what it is; entertainment. You can put effort in your entertainment, in all elements of a game, but it's still entertainment and should stay as such. Being 'art' leads to shit like Braid, FEZ and the respective creators being too far up their own asses about it.
https://www.youtube.com/watch?v=xSXofLK5hFQ