The goal for me is largely just to hold aggro and stay alive against impossible odds, it's what i find fun in tankers. If i want damage i usually go for other ATs.
/Axe and /Dark definitely have some promise, at least playing around with them on the test server.
I wasn't a huge fan of relying on sets like /katana, /staff, or /martial arts for defense buffs to be honest.
Anything i might have missed? Spines mentioned above sounds interesting but i'll need to test it a bit. /Energy seems interesting, but i've never used it before.