I don't think I'd consider Team Fortress 2 a freemium game, even though it is free and you can buy hats in it. The game wasn't originally released or designed with "freemium" in mind, it just happened to fall into that model later in life after the developer had wrung most of the available retail money from the title.

If TF3 launches for free then maybe that will be a counterpoint, but I don't think TF2 really is one.