L4D and perhaps even Portal make sense. They have a story behind them and can be interesting to see more of the storyline that the games did not show. But TF2? How does anyone expect to write a intriguing storyline from it? Don't get me wrong I love TF2 but other than perhaps short comical strips I don't see anything else that can be written for it.
Anyone else praying that they take this opportunity to throw in a little Half-Life 2 storyline to hint EP3? One can wish right?