I'm hoping that no one out there has to rely on the only a Wii for games of this nature because simply put, the Wii is obviously the weakest of all the next generation systems. The graphics are pathetic here and in no way do they compare to the high quality graphics on the Xbox 360 and the PS3.
The major difference is the controls which as the review points out are at the best "iffy" and at the worst "crappy". The Wii Mote is in no way up to the task of offering control as precise as the 360's controller or, naturally, the mouse and keyboard. In multiplayer firefights wii feels like crap and can be frustrating. And that's not mentioning the problems you'll have just trying to play the game despte arm fatigue - which is also going to be a problem in New Super Mario Brothers - since it doesn't support the Classic Controller.
Another huge dissapointment is the lack of blood spatters. When I shoot someone i wanna see their blood go flying!.
When you get down to the bottom line...figure it like this: this game just came out for Wii and its 2 years old. That's pathetic and again, I hope anyone with a Wii also has one of the two other consoles to supplement their Wii. Wii simply is not up to the task of offering ports of new games. At the very best its only good for porting games of the 6th Console Generation (Xbox, PS2 and Gamecube). I use mine for the Virtual Console - where its technological limitations aren't so apparent.