Hmmm couple of pointers I could make for you just because I too run a 5-DK Blood setup:

1) Dont post a video anywhere saying "DKs take zero skill" - You will get the class nerfed and that will just piss off a lot of people, including myself. The recent change to blood aura stacking and giving double health (20% for a 5-box group)is even better, but as you go up in levels and eventually hit the Heroics, you will need as much healing as you can. Dont judge the 5-group setup this early.

2) You have good mobility with your guys, which isn't easy to do, but you are not making use of pestilence properly. On the first mob of a large group, put on your Icy Touch and Plague Strike. On one of your guys, in place of Blood or Heart Strike, replace that attack with pestilence. This spreads the disease on the main target to all other targets, which saves you some time and starts the dmg flowing on the group.

3) Get Improved Rune Tap and get the Glyph for it. That is 60% healing to all DKs every 30 seconds. 20% for yourself and 10% from each of the other DK's helps out a lot.

4) May want to convert party into Unholy and spec deep enough to get AMZ and bone shield while keeping 2/2 of Blood Aura. Later on casters will wreck your group with AOE.

Nice touch on Death and Decay however. You are dropping it efficiently and with all guys. What setup are you using to do this?

I will be posting some new vids myself, but will only post on here. I don't want Blizzard stopping the stackable blood aura effect or nerfing us - I am having too much fun with the guys. They own.