It appears that, for some reason or another, the PS3 offering of Half-Life 2: Orange Box might not be up to par with that of its PC and Xbox 360 counterparts, according to 1UP. After previewing the near final build of the game, they were met with framerate inconsistencies during the Half-Life series that made the game look more like a "slideshow" and thusly rendered it nearly unplayable.
However, Portal perfectly played fine, but they weren't able to play much of Team Fortress 2 because of server connection issues.
At this point, you're probably wondering what the deal is and why can't such a great development company like Valve get one of their shining jewels up to snuff, right? Well, one reason is probably because Valve isn't behind the PS3 port like it was for the other versions. Yeah, we're being serious. An unspecified internal EA development team is responsible for the PS3 version. With a Dec. 11 release date, we suppose there is still time for this issue to be rectified, but how many time have we, as gamers, told ourselves that in hope of getting a decent game? Probably way too many.
[Thanks for the tip, Conor!]