Castlevania: Symphony of the Night is one of the reasons I hold onto my Playstation 2 (as the Playstation 3, for some stupid reason, will not play older games).  I have passed this game several times, and every couple of years I feel the itch to revisit it.  This game is Castlevania at its finest--despite the terrible voice actors and mediocre graphics.  The bosses are tough, as are many of the areas of the castle, and figuring out how to progress in some places can be a challenge, but the rewards are great.  This game has endless replay value IMHO.