The Frets on Fire development team deserves credit for creating a Guitar Hero like game for the personal computer. The good pars of the game end there. The open source community produces many high quality software pieces. This Guitar Hero clone does not belong on that list on the moment.
Bugs and design flaws in open source programs get corrected quickly because anyone who knows how to code can contribute to them or modify it for their own needs. The open nature of this program and its flexibility in allowing users to download songs means it might be a good program if other coders can fix its issues.
Editor's Note: I hate to hammer something like this, and would probably have given Frets on Fire a two personally. If someone can fix that laggy feeling, give the player a clear indication of when the approaching notes should be played, and narrate the tutorial in a more appropriate fashion, the game's an easy hit. The idea of open source song libraries has incredible appeal, but the inability to get the key presses right is obviously not an ignorable flaw in a music game.
Author's Note: Despite its flaws, Frets on Fire is a good idea. He hopes people in the open source community will fix the issues in the Windows version of the game.