Thought I would break this out into another section, so I don't fill the previous post with a wall of text.
Drustaff: Good lord man, can't you get new bracers? (kidding, kidding) The tank set looks fine otherwise.
Ravn: The basic gear is good, but your choice of gems and enchants could be tweaked. Dodge parry and mastery all contribute to mitigation, but according to a few sources, the best stat to drop points in atm is mastery, as it doesn't suffer from the diminishing returns that dodge or parry does. I've been using Mastery/Stam gems in my yellow slots. For red slots i've been using expertise/hit. I would suggest getting hit a tad higher as currently you're at 1% hit, 8% is the ideal you're aiming for. We've been discussing it, and the full 8% is not required as it would take too much away from mitigation (as I just found out on Magmaw). But too low and some of the high dps'rs are going to pull away from you. I would suggest in the range of 5% to 6%. (note if you're really having trouble, a race change to dranei helps tons, if you don't mind joining the hoofed end of the racial pool)
16 Expertise will dodge cap you provided you have that glyph of seal of truth. Going for parry cap would be too much. As far as your skill set goes I've seen you tank in Wrath and you seemed fine.
Krilka's fine.
