Yea, this album is awsome. Sabbaths first album probably beats out their second (Paranod) and third (Master of Reality) easy.
While there's no "War Pigs" or "Iron Man" or "Children of the Grave", the music on this albums blows me away. Tony, Geezer and Bill never go wrong, and Tony's guitar playing is beautiful. Even though you may not know any songs off it, any good guitarist will enjoy this album.