I haven't had much of an issue surviving this tier so far, we downed Thok last night so it's been a pretty fast pace for a 6 hour a week guild. But I've been feeling like my DPS is not up to snuff.
I compared myself to our BrM tank and was like, I hate my life, I wish I could tank and do a metric ton of dps. I feel like I'm really in tune with my class, I've got some really solid WeakAuras set up to make sure I don't miss some key things, etc.. Last tier I started playing my DK as my main about half through ToT, and so I've only been raid tanking since then, but I feel like I understand my spell usage pretty well. Maybe I'm deceiving myself?
The biggest reason I can identify for my lower damage is that I seem to be tanking less, and my co-tank has almost 60% crit so a very offensive build on an offensive tank. Immerseus my tank time was basically a few seconds, as our dps was so fast I would taunt and he would immediately submerge. Spoils I did really well, most fights I did average, Malkorok I did terrible.
In fact as I look at my "damage taken" across most fights, I'm taking a lot less damage in most cases, which leads me to think I'm not really tanking as often. He also always pulls as the vengeance is leveraged better by his class than mine.
With all that said, I want to see what I can do better. Our logs are below.
http://www.worldoflogs.com/guilds/123197/
You can see last tier I did pretty competitive damage, especially considering we didn't cheese any mechanics or do any single tanking, etc. But this tier has been a mixed bag, and I went out of haste and back into avoidance to try that out. Not using DPS trinkets or cloak this tier yet but considering it especially on the first half+ of fights as they are so easy for us already.
http://raidbots.com/epeenbot/us/destromath/tormentus/
I'm open to feedback, especially on things like spell usage etc. I'm not good at digging through logs.