I run a 2H templar. My 8 abilities are: wrath of heaven+, spell purge+, mighty blow+, block and slash+, pommel strike, earthshaking strike+, rally, and charging bull+.
Against dragons, I use charging bull to close distance, keep guard up by running through them, and avoidance. I also use block and slash to completely mitigate most of their attacks. Dragons are too dumb not to stand in the fire, so right after they move, they generally stand in one place for 10 seconds or so. That's when i put down earthshaking strike (which seems to do a lot more than 20% weapon damage per second, some say it's actually doing 200%). I use mighty blow and pommel strike if nothing else is up. I also use spell purge to remove electricity rings or any magical effects that the dragon may do to me or my group.
Oh, and I die...at least once or twice. But I have Viv specced KE with her only active abilities spirit blade, revival, and barrier, so I pretty much pop back up instantly. And my whole group gets a huge damage boost. I giggle maniacally knowing that when my enemies throw me down, that it only makes them die faster.
*EDIT*
Oh, and before it comes up, I have tried swapping out block and slash with combat roll. It does help with my survival, but not by much. I'd rather block and do some damage, than just roll away.
I have considered whirlwind over pommel strike, but pommel strike does 300% damage, is very cheap, with a nice cooldown (+ with my high crit chance, the cooldowns are insignificant). Whirlwind does 70% damage and increases by 15% per rotation. How many rotations does it take to equal pommel strike? I admit if I could somehow hit three targets or thereabouts, whirlwind does seem better. But against groups I already have wrath of heaven + spell purge, and against a dragon rarely do I hit more than 2 things at once.