I think they do need to improve voice chat, but for things like DBM, I don't think it is that much of a big deal. If you are standing in a fire, or need to interupt ect, DBM will tell you and spam blue letters on your screen, but at the end of the day, if it was playing the game for you, you would not have to press the interupt or move. In actual fact, if you are using DBM, you still have to put the same effort into avoiding this danger. You still have to move on your own accord or interupt. DBM is really good for displaying important information to you a lot easier, it does not make you better at actually dealing with the issue, you still have to move or interupt ect.
Arms DPS main spec // Prot warrior tank off-spec