Most cases I don't find tanking boring because I try not to make it boring. Cad, for instance... tanking him is boring because you're just standing there. In Titan HM, you can at least time your shield bashes and slow down/stop tumults early. In dungeons you can run around like a spaz and make it interesting for people. It's just what you want to do with it really. I have to watch everyone's hate meter, health, have to try and occasionally stun a wolf from getting to a WHM if other DPS haven't reached it, switch to Sword Oath and go DPS tank.

P.S. Solo tanking chimera without any BRDs is fun.