Personally, I love games on all platforms and I love Deus Ex: Human Revolution even more. The thing that keeps me off of Macs aside from the premium paid for... well everything involving a Mac is that the standard OS does not support games made on Windows platforms. In recent years, Apple has been integrating components used on Windows machines such as the Intel chipset and allowing people to dual boot machines which let's them use Windows programs and games. Few games try and make the jump to work on the mac, but it looks like Deus Ex: Human Revolution is making a higher profile leap.
Hopefully, there will be enough reported revenue from this move to convince other companies that it is a viable market and worth the expense. If this happens, people won't really have to make a choice between Mac or Windows when it comes to games and even better... they won't have to purchase multiple systems to both play games and to do whatever else it is that you can do with computers.