Video games are art. Meaning that any game, good or bad, is a work of art. To deny that is to deny that bad art exists, which makes no sense.
But were I to name one of the best examples, it would depend on exactly what we're going for. For different kinds of art, I would go for Mass Effect series (for non-linear, player-centric storytelling), Final Fantasy VII (for traditional linear storytelling), Shadow of the Colossus (for uniqueness, visual beauty, and symbolism), Bioshock (for one of the best examples of interactivity in the context of a linear story), Okami (for absolute beauty on all counts), Clannad (for romantic value and many, many tears), and The World Ends with You (to display games' ability to convey positive messages).
All at the very top, but all for quite different reasons. Video games are an extremely diverse artistic medium, moreso than any other.
But were I to name one of the best examples, it would depend on exactly what we're going for. For different kinds of art, I would go for Mass Effect series (for non-linear, player-centric storytelling), Final Fantasy VII (for traditional linear storytelling), Shadow of the Colossus (for uniqueness, visual beauty, and symbolism), Bioshock (for one of the best examples of interactivity in the context of a linear story), Okami (for absolute beauty on all counts), Clannad (for romantic value and many, many tears), and The World Ends with You (to display games' ability to convey positive messages).
All at the very top, but all for quite different reasons. Video games are an extremely diverse artistic medium, moreso than any other.