Welcome to Wiichat. For MWR, in Shipment, it's VERY easy to get kills. You just have to be sneaky, and start knifing people. I remember this one time, on Domination, on Shipment, they tried to take A, so, I either shot them or knifed them. I got 50 kills on that game, with less than 10 deaths.
Welcome to Wiichat, again.
Also, there is no possible way to talk to people online on the Wii. Very dissapointing.... You can't do voice chat, only text chat, but only for Animal Crossing.