Ninja Gaiden Sigma which was honestly, a horrible choice. I hated that game, I have no idea why it's so well recieved. This was disappointing because your first game for a new generation console should really blow you away. Going back, these were my first games introducing me to a new generation...
NES: Super Mario Bros (duh, fantastic)
Genesis: Sonic the Hedgehog (Great)
Playstation 1: Crash Bandicoot (Amazing, so much fun)
Dreamcast: Sonic Adventure (Holy graphically intense eggman!)
Gamecube: Metroid Prime (Mind blowing at the time, classic game)
Wii: Wii Sports I guess (fun for a day, then you realize how useless the Wii is)
PS3: Ninja Gaiden Sigma (Sucked, I actually did beat it but never played it again).
On top of that, Sigma was a pretty bland looking game and not a great way to be introduced to the "Next Gen" hardware. It really just seemed like a shiny PS2/Gamecube game. You should always be blown away by the leap taken (Crash Bandicoot, Sonic Adventure, and Metroid Prime all did it for me).
I now own 13 games for it (not to mention a ton of PSN games), all AAA titles in my opinion, and with the exception of the original Playstation1 (you'll never beat the nostalgia of that era for me, even if the games are a lot better now), this is definitely the best console I've ever owned (Gamecube is a pretty close second however).
