The five games that immediately come to my mind are Conker: Live and Reloaded, The Legend of Zelda: Twilight Princess, Halo 3, Mass Effect 3, and Skyward Sword. Fortunately, all of them (aside from ME3, pre-Extended Cut) lived up to the hype for me, and are among my favorite video games of all time.
Today, the only two games [that have been officially announced] that I'm really looking forward to playing are Halo 4 and BioShock Infinite.