Soooooo I have MSV under my belt, but still a little nervous to hop into the last 3 to tank them yet. I'm a blood DK, if that helps. I've done the fights as DPS, just don't know the nuances of tanking them.
(http://us.battle.net/wow/en/character/the-scryers/Intangir/advanced is my DK, any tips would be appreciated as well.)
for tsulong i would highly recommend keeping an eye on shadow breath cd. you want to position that away from the raid when it's about to happen, and when it's not about to happen you want to position Tsulong close to the beam of light during light phase just death grip the big sha in front of tsulong
for Lei Shi you want to take the stacks off the other tank around 10+ stacks or whenever your debuff falls off Do not take sprays and adds at the same time. If you're not communicating with your tank just let the adds run all over the place if you're taking sprays.
for Sha of Fear just stand in the light. When you get ported to the platform get some threat on the fat panda and run around collecting orbs.
http://i.imgur.com/2EJdw.gif Rogue PvP in a nutshell.