Thing is, personally, I prefer a good balance of things. I do prefer quality or quantity, but I don't a game to be like 6 hours but have the most amazing graphics ever, or have a game that takes f****** forever to finish, because eventually becomes dull and tedious. I don't care if a game is short, as long as the game plays well, that is all I need. I can easily wait for the sequal. I am going to take Tomb Raider: Legend for example. What an exceleent game. Great graphics, spot on controls, fluid animations, not heavily buggy, enjoyable. But the game was quite short (roughly 8 hours). But it was worth the money I paid. The Elder Scroll's IV Oblivion for example is a game that takes forever to finish, and it really becomes boring and is such a chore to play after a while.
But like I said, I like games with balance. Tomb Raider: Underworld and Half-Life 2 are good examples of games that balance quality and quantity. Both games are not too short, but not too long, and have outstanding gameplay to make it enjoyable titles that deserve Game of the Year.

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The look of love alarms Because 'tis fill'd with fire; But the look of soft deceit Shall Win the lover's hire. - William Blake