Not that I don't understand WotC's game design philosophy, I do. I understand it all too well. But a whole class designed to let players be vampires is yet another example of making the game less fantastic by making fantasy elements of D&D mundane. You can already be a dragon, a demon, an orc, a goblin, an angel, a plant, a giant, a crystal, a construct, an elemental, and the list goes on. What's next? The ooze class so that player characters can be oozes? Where do we draw the line? 4th edition, for all of its excellent mechanical features, is really taking a huge chunk of the "soul" out of the game.
But for those out there who have always wanted to play a vampire in 4e and finally have an "official" version, this is all probably meaningless rambling. I just miss the days when dragons were fantastic creatures you didn't run into every day, orcs were evil monsters you killed on sight, and becoming a vampire meant the DM would take your character away.