Framerate is fine. Go buy this game.
Based on reading the reviews from other sites, I thought the orange box would be unplayable on the ps3. They were wrong. The ps3 has nowhere near the problems that the sites said it had. I had hardly any framerate issues while playing through the whole Half Life 2 series, certainly nothing that other sites complained about. The loading times are a bit long but are still manageable.
Each game could stand alone as a great game and be sold for $50 each! Valve is giving us the deal of the century so you should definitely buy it. I will probably be playing team fortress 2 at the end of 2008 it's so fun. Portal is short but a great puzzle game and very innovative. The half life 2 series is one of the best game stories EVER. I don't know how I'm gonna wait another year for Episode 3 to come out. Multiplayer- check. Story- check. Graphics- check. Gameplay- check. Alyx- check.