hyson, WaW is a fun game online for sure. When I lived in Madison 2 years or so ago when it came out, we played it all day online. It was the first CoD on wii that was online, and although the graphics are nothing to look at, it is fun. I logged in last week for the first time in forever and was amazed there were still games to play. Lots of people still playing this old game. I have Black ops, MW:reflex and MW3 for wii also, and the fact that WaW is still active is impressive. I suggest you try out black ops or Mw3, the online is great and controls and graphics got a nice improvemen too.
World at war is fun though because it's a lot of running and gunning more so than other CoD games, at least on wii. I was a fiend when it came to stabbing people.