I raid on my BrM, BDK, and VDH and and holy crap, the cheese I can do on my BDK is just comical.
I can solo tank every hammer on the Maiden with no externals, something even my BRM can't do. Avatar and KJ are much easier to tank (although I miss the mobility on KJ) and I can do more HPS than half of our healers.
I think our biggest cheese factor comes from the fact that you can get a 1.5m CD ability down to 30s or so with the talent/leggo. Vampiric Blood is just too strong right now. It's about as good as a Warrior Shield Wall, except you can use it twice per minute.
I just don't see this ability continuing the way it is. For 10 seconds out of every 30 or so seconds, I have 55% more HP and take in 55% more healing.