People are less mad that it's delayed than in the manner which it was handled by Valve. Saying "on schedule", "release date unchanged" "remains sept. 30" and then going quiet about a week ago, and now the date is "pushed bacK to an unknown date" a week before.
Unless their building burned down, they probably suspected it would be delayed some time ago. And what's more, they still haven't released an OFFICIAL PRESS RELEASE. It's all emails from vps and stuff. I know they like to be weird, but can't they have a website like everyone else, and post their own information?