Going slightly off topic, but you did ask. Find Zombi U is very different from playing C2 with the WiiRemote.
Firing the weapons are easy, but aiming them and actually getting a headshot takes practice. In C2 you just raise your wiimote and point at the head if you want a headshot, but in Zombi U you need to use the right stick on the gamepad.
And will say that I love Zombi U, its a completely different game.
Compared to C2 its altogether different shooting game. But worth getting used to.