I disagree.
I have been playing as shadow tank since I got Tharan Cedrax (as a healer) and I am
having a lot of fun.
You have a 60 segs CC out of combat, you can CC in combat for 10 segs, you can interrupt, you can put out of sight of ranged adds, and yet not having as much dps as others trees you can deal even with elites with six times your HP.
And always with Combat Stance on.
I am not saying the others trees are boring cause I have played as Inf up to level 24, and have not tried Balance yet, but as a tank I must pay more attention on my actions and anything that may happen around. As a dps I used to focus on burst damage regardless the environment because with a high burst there is no time for the adds to use any abilities.
This is just concerning leveling and any adds (either weak, normal or elite) that you can find around, not talking about dungeons.
Salut