I did a Tower of Zot earlier with a DRK and he was taking so much damage I had to pop almost every cooldown to keep him alive on some of those pulls.
I checked his gear and it was on par with mines, and I noticed he was using TBN and several cooldowns.
Got it again an hour later and had a WAR and I didn't use a single cooldown. I almost went OOM because I didn't need to use any of my Addersgall Charges besides Raid Wides. lol
I just dread it when I see my Tank is a DRK and I feel so bad for them.