"Art" has more or less become a meaningless word, because everyone can call what they create art.
Art is used both for painting, sculptures, litterateure, movies, music, performances, events etc. Basicly it's used for everything, as long as the ones making/doing it, or the ones watching or otherwise 'consuming' it chooses to call it so.
And the quality of said "art" will nto help, because it's subjective
There'll always be someone who finds the work of art extremely interresting in one way or the other, and others who disagreee and think it's shit.
"My four year old could've painted that" is an argument used regularily, about some pieces of (usually abstract) artwork, which is often countered with "you know nothing about art, you don't understand it"
The first argument been used to make jokes on art critiques several times, where established artists has had their actual 4 year olds (or whatever age their toddlers was) paint a picture, then claim it was their own work and then recieving tons of praise from art critiques before releaving, that the painting was in fact made by a 4 year old.
Music as art also has some good point to keep in mind. While most people agree that classic masterpieces such as mozarts stuff is art. What about radio-music, the kind of stuff that gets played over and over in popular radios? some people woudl say yes, cause it's awesome (regardless of whether it fades into oblivion after a month or two or not) some would say yes, cause they just consider music to be art by default, some would say no, cause they see it as soul-less mass-produced crap, and in the end, no-one has any authority to make a defining statement.
As for video-games, most games have a story, and because of that, they can proclaim themselves to be art based on that, the same way litterateure and movies do. Whether the story sucks or is good doesn't make it less art than books or films, cause theres shitloads of bas stories in book/film form as well.
Games have graphics as well, to be more excect, an near unlimited number of possible frames that can apepar on your screen.
Each of those frames is a picture in itself, theres no arguing with that.
Each of those pictures could be classified as art, solely cause pictures are considered artwork by default.
And even if you went and said that the "random" computer generated pictures that comes to your screen based on your (and the online crowd you're playing with in casde of online games)s input doesn't count, cause they were made by chance with no art in mind, you still have all the cut-scenes whether made with the games engine or hand aniamted, or pre-animated quick-time events, where your char usually doesn something over the top (especially in hack'n slashers), each of those are made out of a number of keyframes, wih a lot of automaticly generated in-between frames.
In animation, whether 2d or 3d, keyframes are made with composition and everything else an artist would use if they were to paint such a picture as a single stand-alone image in mind.
Also, the models in the games are not just called models for the lulz, they're modelled digitally, and tehrefore are themselves digital sculptures animated afterwards.
In the end, whether or not people sees a game as a whole, as a piece of art (which as explained would make no sense not to, seeing how art gets thrown onto all kinds of things) no-one can deny that theres shitloads of artwork in the games, Both in the form of sculptures, images, story, music, interactive performances etc. Then it's up to the individual to decide whether they think it's good or crappy artwork. But regardless, anyone saying games has nothing to do with art really needs to think about, what they do consider art, and why, because if they have a "normal" perception of what is art, they're acceptign games themselves, or (some of) the elements games consist of to be art.'
Ps. All spelling and gramma errors in this post is an artistic statement by yours truly :/