Blame Valve for dropping the ball. They simply don't care enough about their product to ensure a quality effort. They farmed it out to EA!
There is no excuse when other developers like Naughty Dog, Ninja Theory, Infinity Ward get results on the PS3 hardware. The microsoft millionaire has a known phobia of non MS/Direct X platforms. Valve has never traditionally done "console" games. But they could've handled it a lot better. Selling slapped together ports reflects poorly on them. The box says Valve not EA budgetware.
A shame for any PS3 owning OB fans, but most I suspect have got it for PC already. I got my copy for $25 on black friday. You never get new A+ console games that cheap.
Gabe said in so many words that he does not like the PS3 at all. I don't think it's that surprising that Orange Box doesn't perform perfectly on the PS3. I'm not saying that is right, just not surprising.