So one more person to check out in the gaming world. My money is on whoever runs Valve since they seem to make pretty good games... whether or not those games are art though... my inner primate says yes whilst killing zombies yet my higher brain functions say no.
However, the epic saga of Gordon Freeman was something of a piece of art.
I mean, like all great works of art (especially writing, specifically poetry) the phrase that rings most true is "one only ever abandons instead of finishes them". Paraphrased of course, but it does seem fitting for Freeman's story.