Game Daily is featuring an interview with Epic's CEO Tim Sweeney. In the interview, Sweeney indicates that PCs are not the best platform for gaming...though not because of the medium but because of PC makers:

it is very important not to leave the masses behind. This is unfortunate, because PCs are more popular than ever. Everyone has a PC. Even those who did not have a PC in the past are now able to afford one and they use it for Facebook, MySpace, pirating music or whatever. Yesterday's PCs were for people that were working and later playing games. Even if those games were lower-end ones, there will always be a market for casual games and online games like World of Warcraft. World of Warcraft has DirectX 7-class graphics and can run on any computer. But at the end of the day, consoles have definitely left PC games behind," he said.

The article goes on some more and is worth reading so check it out.