Red Steel 2 has a decent size story mode. It could take anywhere from 8-15 hours depending on whether you get stuck or not. It is hard to play for more than an hour a today because the Wii motion tires your arms out, so that also extends gameplay time.
There is very little replay value in the game. After beating the story mode, the only thing left to play is Challenge Mode, which consists of beating the story chapters as quickly as possible. You have all the current upgrades for the story profile so that makes blowing through the chapters easier. However, for some bizarre reason you must still do all the tutorials. I dislike this setup for the Challenge Mode. The game would have had more replay value if there was a new game plus mode that allowed you to restart the story over with your current upgrades and change the difficulty and a more traditional Challenge Mode that gave you short missions with specific goals.
The biggest missed opportunity for replay value though was the exclusion of any multi-player modes. With a few tweaks multiplayer could have been a blast in this game, for both online and local split-screen.
Overall Red Steel 2 is vastly superior to its predecessor. It is prettier, it controls better, and it is not as frustratingly buggy. It is also a good example of the right way to program a game for the Wii MotionPlus. But despite all of its qualities Red Steel 2 is lacking a few features that would have pushed the game from a great game to a classic.
Red Steel 2 is rated T (Teen) by the ESRB for Animated Blood, Mild Language, Mild Suggestive Themes, Violence.