I'm working on the Wii version of the game now. There's no online play, and the sharp decrease in visual clarity makes it hard to pick out targets in long distance firefights.
The Wiimote doesn't enhance the experience. It isn't better or worse, just different. It's definitely weird that you can never stop aiming. It's a lot easier to keep steady aim with analog sticks, because your crosshairs stay where you leave them. And if you reach up to pick your nose with your right hand, your guy practically does a backflip.
It works, though, no doubt about it. I really like the fact that you can twich the nunchuk to switch weapons. I'm going to go fool around with it some more right now.