Castlevania fans are probably still scratching their heads over why exactly Konami created this one. It is such a different game to the original and the excellent third game, incorporating RPG elements and chatting with townspeople as well as the standard whip-wielding fun. At the time of its release, it was not well received.
This would be a game I normally could not recommend, however, when playing on the Wii Virtual Console, it suddenly becomes a lot better. Why? Because of the "resume play" feature (like save states in emulators), that allows you to continue from where you left off, instead of fumbling around with huge passwords. Overall, it is a long, enjoyable adventure game that should be tried out if you're looking for something a bit different.