Gabe Newell has called Microsoft's process for patching on the Xbox 360 a train wreck, discussing the disparity between the post-launch of support of Team Fortress 2 on the PC versus the Xbox 360 in The Orange Box.
"We thought that there would be something that would emerge, because we figured it was a sort of untenable," explains Gabe. "'Oh yeah, we understand that these are the rules now, but it's such a train wreck that something will have to change.'"
Gabe refers to the fact that issuing updates to Xbox 360 games after release cost the developer money and significant changes, requiring large amounts of new content to be downloaded cannot be offered for free, in most cases. This is why much of the content PC gamers get for free is available as paid DLC on the Xbox 360.