Edit:I meant STEALTH ninja game.Ninja Gaiden is awesome.
While playing Ninja Gaiden series this month, I remembered legendary ninja series:Tenchu.
It was so much diffrent than Ninja Gaiden...You had your whole map in your use, and you could go all the way without anyone seeing you and killing anyone you would want, like a ninja.
Last good Tenchu was on Ps2 2003...After that, many fans (like me) have lost hope for the series...
But I think there is room for stealth styled ninja games this generation, so whats the problem?
Assassin's Creed did great and its very similar to Tenchu series..
Take my love, take my land..