Bladedancer gets some nice bonuses to Dodge, plus Strike Back (50/100% chance to counter with both weapons after dodging), Reprisal (GCD-free dodge/parry reaction), and False Blade, and all those are from the first two tiers. There's more avoidance-related goodness if you're willing to go deeper into the Bladedancer tree, but IMO, while dodge/parry is nice, it's too streaky to rely on, especially if you don't know your healer.
ya... I'm going to have to explain why this is kind of bad advice. There were alot of tanks in wow that thought like this... and its wrong
as a RS your a mitigation tank through armor and dmg abs shields... with BD you add in some really good avoidance tanking, and i've yet to see a RS build that didnt have some pretty deep specing into BD, (except for the 51 rs build... and I've watched them die a couple of times for luls) because basically thats what BD was made for. http://rift.zam.com/en/stc.html?t=1MpVc.xIt0uqzokkR.E0kV0c00M.xh
thats my build... its one of the more popular tanking builds for rogues. In my gear i end up with about 30 to 40% of dmg avoided with the ability to increase that by poping a cool down to 80 to 90%. That combined with gear dmg abs around 35% and the barriers makes tanking pretty easy.
Since i also play a healer on my mage and when i was in wow, i know just how much healers love avoidance over mitigation.(i actually liked healing DK and Bear tanks if they were geared right)
Also the only way i see it, for tanking, trion is right in saying the Bard is a good combo as well. With 8 points you get 10% more health and 3% decreased chance the mob will hit you... no DPS soul will have a comparable effect.
For tanking, if you new to it on the rogue, do this
macro shadow blitz, rift disturbance, and phantom blow to 1 button... this is your point generator and threat generator... this way you always AOE tank to your max (i never use CC cause CC is for noobs (jk))
first 5 points- if chloro do a Rift Gaurd finisher (chloro's start up healing is a little less than the clerics, so sometimes they need a little help)
otherwise get gaurded steel up (or if the chloro is doing good and you feel safe doing it)
next 5 points after gaurded steel is up get false blade up.
when i tank, i never worry about dps... after all... im a tank. So i always finish with Rift Gaurd, unless its a non elite trash pull (use compound attack) or i finish with one of the 2 60min buffs you should keep up
Plane shift as you see fit... i usually dont have to, shadow blitz gives you some nice abs when it goes off... If the boss is one that you have to move alot, i use shift to move him usually.