All these points are valid, which leads to MY problem: staying alive. The second you unload on a clothie (healer, mage, whatever) the other team knows there's an MM spec hunter on their buddy. I usually get intercepted about 2 seconds after that and it's downhill from there.
If you're lucky enough to drop the clothie in time, it's a bonus, but really, timing is everything. You almost need to do max damage then run/kite. Let your teammates finish the job as you just try to survive. If you have a healer available, your odds of living go up tremendously.
After their healer is dead, you can let them focus on you (again if you have a healer) and the rest of your team can pick them off one by one. 3v3 isn't as hard as 5v5 in this area. After all, 1 down is not the match in 5v5, but 1 down in 3v3 is a large loss of power.
In the instance where you are target, LOS can be your friend. You can't be intercepted through a pillar or an obstacle. Use it to your advantage when running and kiting. I'm usually too late to make effective use of it. It's that darned timing thing again. I'm getting better though with each week.
Definitely get the AXE if you haven't. I just got it and while my agility dropped, my tooltip dps jumped. Awesome weapon, ugly, but awesome.