Something interesting about the Xbox 360 version of Team Fortress 2:
Notice the strange pattern with flat colored surfaces? I'm pretty sure that's dithering. I bet this game runs in a 16-bit color mode, probably to help save on VRAM on the console, which isn't exactly prevalent. This game effectively runs at an equivalent of PC's high settings, with differently-formatted textures and more compressed textures, no anti-aliasing and I think trilinear texture filtering.
The game runs at 1280x720 so I bet Valve was pulling every trick in the book to preserve the game's look without reducing the settings too hard to save on VRAM. Too bad this has a knock-on effect of making the game run really poorly; this game's both CPU and GPU bound on consoles and while it can hit 30fps a lot of the time, the frame pacing is hilariously inconsistent and the ease of making the frame rate tank is just as hilarious.