Do all the best mac games require an internet connection? I'd like to run a good strategy game but see that, for example, starcraft 2 require internet (save in a guest mode where progress is lost).
Online is the trend. If it's not a multiplayer game (eg. SC2) you tend to need it for the DRM. Many if not exactly all newer games expect connectivity.
I will be without my fibreoptic internet soon (nooooo!). So I plan on using tethering to the iPhone. It should be good enough at least for the DRM stuff. And I have read people able to do battlenet sc2 gaming via iPhone tether. I hope that works!