Journey is art. It's the only game that I can think of to which I can legitimately apply that label. There is no dialogue, no combat (unless you count avoiding the one type of enemy), and only minor puzzle elements. For much of the game, there is only you, trekking through deserts, ruins, and eventually up a mountainside. Along the way, you may encounter other players, with whom you cannot communicate by voice or text; you are free to aid or ignore them as you will, and they have the same freedom. From time to time you encounter shrines, which show you visions of the rise and fall of the civilization that created the ruins through which you travel.
Journey is neither a long nor a complex game; it is essentially an interactive tone poem. At the beginning, it evokes a mood of curiosity: where are you, what is that mountain in the distance, what can you learn or gain? As you set out, the astonishing vistas inspire wonder, and the creatures (all made of the same gold-bordered red cloth as the player's garments) a sense of whimsy. Later, as the history of the fallen civilization unfolds, a sense of wistfulness and melancholy sets in. When you encounter the first enemies, fear! You cannot die, but if they catch you... well, that would be a spoiler. I won't tell you about the ending, except to say that it is well worth the experience.
Journey is a gem of indie game development. The art design is strikingly gorgeous, the soundtrack wonderfully done and perfectly fitting, and the game design both simple and elegant. Roger Ebert is wrong: games can be art. Thatgamecompany have proved it.
Bottom line: I rate this game Excellent (5/5).