The fuck? Bejeweled? Wii Fit? Wii Sports? Super Mario Galaxy?, (aside from Bejeweled I'm noticing a trend here.)
Halo is the decade's stand-out blockbuster, World of Warcraft is the decade's stand-out... pandemic, Guitar Hero dominated in the "party game" department, The Sims could probably fill a whole fucking game store with all it's expansions and sequels and Half-Life 2 is... we'll Half-Life 2 is actually good.
GTA3 is a huge surprise, especially at #1 and especially due to it's younger-but-bigger brother dominating game sales and game reviewers' mouths, (ew.)
All in all though I sense that this list was put together either by someone who hasn't played any game since Pong or a post-op lobotomy patient.