I liked Tenchu for PS2, it was a good game.
The game really isn't hard at all, once you learn the basic mechanics of the game, which I didn't because I've already played the game before, you're all set. There's so many was you can play a certain missions including secret missions which increases replay value and the graphics is very good, at least relatively better the most other PS2 games of this type. It's a good game buy it.