Either start with perfect balance or with axe kick. When I see the other melee uses all his cooldowns I start with axe kick, if he is delaying the burst go with perfect balance. When it is a nin which goes into hide, try your luck with arm of destroyer and lure him out, he will be pissed. Take care of blackmages use somersault for that, if they pop buffs give them a stun if they are not immune, if they sleep your healer and he cant purify himself go help him and purify him, you can even perfect balance and silence them for 5s if you feel like it. I hate machinists, they have a crazy burst sometimes some attacks hit you around 6k if you are stunned, they are using blood for blood too, this is an opprtunity to attack them and stress their healer a little more.
If you are getting targeted use featherfoot (ye you will evade stuff and sometimes if you are lucky like 5 skills or something and if you are even more lucky you evade something like the enemy monks axe kick), use keen flurry, foresight, fist of earth. Always purify on full swing that is a 20% dmg increase on you, it is a tank skill just look up the buff icon so you know how it looks, combination with blood for blood and fullswing are pretty deadly for you. You might wanna use a makro which turns off b4b for that reason when they focus you, if you dont want to remove an actual buff in the heat of the battle.
Do not fight in the sacred prism of an enemy whitemage, it reduces physical dmg by 40% or so, unless you are really close to killing something, otherwise try to lure them out, make him practically waste that powerful skill.
Try to get a feeling when boxes (lb,buffs) spawn, I think first offensive depot spawns at 4:00 min left, then again at 1:30 or something not so sure about that one.
I don't know if this is common, but I tend to be the guy who is marking the targets in like 80% of the matches. You are a melee after all, range dps can switch targets easier than you.
Try to be aware of your surroundings if a healer is going to die and you can focus the other dd quick or you have to retreat to your base to get closer to the respawning healer.

Lately I switch more into fist of wind in order to catch up to healer who are just outrunning me as I would be a turtle or something (thanks SE for removing weapon throw from melees).

In general you gotta think about what important skills they already used and if it is possible to actually kill the target now or do you just waste your cooldowns because they can counter them. If a healer popped benediction, divine seal&presence of mind(these 2 can be removed by one ilm punch too), tetragrammaton and also attunement, he has a hard time to counter burst. Same goes for other healer except scholar they are op.

Anyway if you cant kill the target always blame the other dd or the tank if he is not a warrior. so far