This is a very old argument which goes back all the way to when videogames began. How exactly do you measure a videogame as art if at all? If you look at most widely acclaimed games, a lot of them don't get praised for their gameplay but rather their story, which is especially common in acclaimed RPG's where the story is supposed to be the focus. This is not a "cinematic games" problem as a lot of people like to say because games like VTMB, Silent Hill, Planescape: Torment etc. are all old and are more akin to watching a movie/reading a book than most new games. So are "art" games a sum of it's parts? Are they only judged for story and graphics? Most importantly, ARE games art at all, or maybe only certain games?