I could reply a book on Red Snow's must play games. Instead, I'll give a couple and you could pm me for others or specific genres.
Dragon Age
Dark Souls
FF7,8, 10, 12
Legend of Zelda (all)
Silent Hill 2
Metriod , Super Metroid
Star Wars Battlefront 2
Eternium
Diablo 2
Devil May Cry 3 Sp. Ed...