"Crysis might look superior but at the price of a 2000$ rig. All the engines Carmack produced were rather optimized at the time of release. I'm looking forward to playing Quake live, if just for old times' sake."
My 850 dollar upgrade plays Crysis at high at 30+++fps at all times. Not really sure where the 2000 dollar idea comes from.
And Doom 3 ran like a fucking WHORE when it was first released. And didn't really look all that great for what it was hyped up to be. The "real time shadows" were everything but real-time. (point in case, find a steel beam that has a light shining on it. Take your flashlight and shine it at the beam's shadow. Notice how the shadow doesn't vanish but just becomes lighter. Ergo, these shadows are simply mapped and not real time.)