If your computer is from 2004-2005, you can run Unreal Engine 3 games. Albeit, with tweaks and low settings, but playable.
Also, I dunno if I'm happier for it. I love Source, despite it's flaws. Sure, the newer videos look insane, and will surely be better than AoC ever was, especially the hit detection, but still...I've never found a Source based game I did not enjoy.