Gamestooge.com's Jonah Falcon writes:
"Advertised on the box of Guitar Hero II, the game brags you can play various songs, such as "Tonight I'm Gonna Rock You Tonight", "Sweet Child 'O Mine", "Carry On My Wayward Son", "The Beast and the Harlot" and "YYZ". Ah, but there's a catch: they're not freely available. In fact, only 6 songs are available right from the get-go, and playing through the entire Easy chart only nets you 37 of the 70 songs. That's right, barely more than half. In order to get the others, you must earn them - and some are difficult to get.
Why must one have to unlock songs? The consumer just paid $90 for your product, and deserves immediate access to the products that are paid for. One should not have to jump through hoops to access what was advertised on your box. You want to make the consumer jump through hoops? That's what Achievements are for. That's the entire raison d'etre of Achievements (aside from tracking your progress through a game for all to see.) Getting through Easy gave Achievements, for example. However, getting through Easy doesn't even unlock songs."