It's not about like or dislike, it's about effort and purpose.
By your reasoning, everything is art. If I dump a paint can over and someone else paints a mural on the side of the building, would most people consider both to be art? A little bit of common sense goes a long way.
I think video games, like any genre of creative orginazation of human effort can be considered art. Like or dislike is obviously not the consideration. I hate RTS games but clearly WC3 is a quality product with true artistic merit. I also think a crappy game, just like a crappy painting, should not be considered art. Shoud it? Under what merits? That it exists?
Fine, maybe it would suit you better to focus the argument on good vs. shitty art. In this way I can consider dog urine artistic.
~Anselm~