I couldn't help but notice that in the beta B-roll footage some skills and even monsters didn't have sound. For instance:
http://www.youtube.com/watch?v=vbGeuFkZIMI

At times 6:50 and 6:52 the sounds for Fan of Knives literally don't play. It looks really weird and should be addressed -- I'm sure it's a bug, but lots of people are seeing this.

Another example is 2:43 and onward. Aside from the blue shots having a weak sound to begin with, you will notice that if the DH fires them fast enough it will skip the sound entirely (2:54). One of the monsters she kills near the beginning of the encounter explodes, but with no sound. Beginning at around 2:58 and onward, multiple blue shots have no sound, and the death of the last "champion" monster explodes again with no sound.

Come on, now.