Post any game you think is underrated...
IMO, I say
Trackmania Nations Forever is really underrated...
At first, people came rushing in...then large, upcoming, hyped MMOs came and they uninstalled it for room...now it is forgotten by many. Now when people look at it they think, "Eww, a racing game!". The game's pretty fun with its track creator/editor and needs a 500 MHz proccessor and 256 mb of RAM for XP, and 512 mb of RAM for Vista.