Not so sure why they are doing so bad. My DK is sitting at 65 and starting to get used to tanking with him. My shammys are at 70 and they haven't pulled aggro off of him. Death and Decay with a simple dps macro and things have been going really well. I've been leveling unholy and swinging a 2hander. If the DK's you running with are DW, then like Fur says, they do have a tendency to miss a lot.....