Since this issue is something I don't care enough about to argue over, I'll leave them to be, as most of your points are slightly valid with some issues.
This one however irked me.
The unholy mastery is is the EXACT same as the feral one (my PVE-geared DK with 13.42 mastery will have 67% increased dot damage to set an example on how emphasized unholy DKs are on dots), yet unholy diseases do nowhere near the amount of damage compared to feral ones. And the "your other damaging abilities make up for this "fact."" crap can be applied to ferals just as well. We even have a disease version of mangle in ebon plaguebringer.
Moving on.
Edit: And about the video. Regardless of if he was fully PVE-geared with stacked mastery (which you can't stack that to high in Cataclysm from what I gather).
The warrior was fully PVP-geared, and second wind and blood craze were proccing constantly, yet bleeds ALONE took him down that low.
I don't care if he's two tiers above a fully geared PVP-warrior. Bleeds alone should never do that much damage. Nor dots for that matter.