I think Nintendo knows about their reputation as a 'kids console', so they will step it up with the Wii and put more 'adult games' out...
If Manhunt 2 comes out, then the Wii is a must:
"The big feature in the Wii demo was the game's control scheme, which made smart use of the system's controller. The basic system was laid out on the controller pretty much how you'd expect. Melee combat is performed by waving the remote left and right. The big hook to the action is the way the controller is used during the various kills. You'll now have to actively follow onscreen motions that approximate your actions. Throwing a chair? Hold the Wii Remote and analog stick as if you've got the chair in your hands and move it accordingly. Stabbing someone? Jab that Wii Remote. The kills we saw typically involved three steps that varied according to the level of the kill. In addition, the minigame for hiding in the shadows requires you to follow onscreen prompts in order to stay unseen. The system is a cool use of the controller and gives the game a good, unsettling feel that works well with its story."
and
"The visuals in both games were good for their respective platforms. The PlayStation 2 game obviously looked a bit blocky, but it had a good assortment of special effects and filters to dress it up. The models and environments were well done by PlayStation 2 standards, along the lines of Bully, but they don't challenge the best seen on the system, like God of War 2. The Wii game obviously had the edge in visuals, with a sharper overall look and solid frame rate. The game's widescreen support also helps give the cinematics that tell its story a nice kick."