The most fun method of killing enemies is to use cadaverous laceration (forwards with the left analogue stick and square), this will hit them numerous times and send them rocketing away from you, but when this happens, hold their bodies in the air with telekinesis,. And pull them back towards you for yet another barrage of cadaverous lacerations and repeat the process.
This works best when there is only one enemy left, but works fairly well with others around as well, because it builds up your charge attack with the reaver. I also believe, however, I am not sure, that this method increases your experience and gains you new abilities, such as nightmares hammer and sanguine censure, swifter than normally.
It also allows you to see the truly fantastic amount of blood that these characters contain.
"You shall have the blood you hunger for." - Mortanius - Blood Omen; Legacy of kain