Mario Kart is awesome ...
I haven't played all the COD games but man I was hooked on those zombies in World at War as well. Lately I been playing a little COD Ghosts. I haven't played the Black Ops games. It was hard picking three as there's so many great games out there.
Haha yeah I know man! As soon as I wrote my 3 and all the comments came in, I was like, oh that one, that one, that one!! Damn, missed a load but we might revisit and do a subset, see what's popular and go from there! Ghosts I found was a little bit slow in the multiplayer but the campaign mode was excellent