Usually when I do hear people talk of underrated games two come to mind, Eternal Darkness: Sanity's Requiem and Spec Ops: The Line. To me these games should get loads more attention than they've gotten. Wonderfully crafted stories, excellently detailed characters, and such rich and powerfully written narratives. Yeah both games have kept me up for nights on end, but I still hold them in high regard. Oh and they both had killer soundtracks.