Well, this is a loaded question. For me though, it has to be dr_playstation_final. I have so many fond memories of this map, I can also appreciate the attention to detail the creator took in creating each of the traps and ending minigames. The map is challenging, but not complete bullshit. ahemTROLLRUNahem. Concerning tf2 maps that are used in casual, It would have to be Harvest. I've always loved small maps, but there is just something about harvest that I can't really explain that makes it my favorite.