How I make a half decent HA build.
First you need to think wether you want to make a spike or a pressure team. If spike, is everyone going to have the same spike skills or are they all going to be different. If pressure waht kind, mainly damage, conditions, hex or monk shutdown.
Firstly get 2 healers this can be either:
2 monk backline Build:Team - HA 2 Monk Backline or
2 prism ele backline Build:E/Rt Ether Prism Healer
With either backline it is nice to get some support, though is not needed
For both backline:
For Monk backline:
For Prism backline:
The 2 optional skill can be Grasping Earth and Ward Against Foes or "Make Haste!" and Song of Concentration
That is now 3 people out of 8.
For HA a few support skills are needed for the other HA type (capture points etc):
Song of Concentration
Ward Against Foes
and a few anti-enchantment eg Rip Enchantment and Rend Enchantment
These skill are to contained within the other 5 people which can be used whenver it is needed.
Now we need some Frontliners, usually there are 2 but 1 or 3 are also good depending on the rest of the team.
Need an Elite and either Natural Stride or Lightning Reflexes. Grasping Earth and Ward Against Foes, Make Haste and Song of Concentration or Hunter's Shot and any skill rom the past choices.
After that your midline is important these are the ones usually carrying the support skills.
You will have to think carefully wether you need more damage, monk shutdown, general support, condition spread or hex spread. But obviosly many build will be in many of these catagories. And even though some builds might show it with Ward Against Foes and Grasping Earth, Using other suitable skills are fine and Make Haste and Song of Concetration is always an option if not already in your team.
There are so many more builds possible to use but I can't mention them all (made a good attempt at it though).
So to choose which midline can be a problem but just think what you are trying how you are trying to kill the enemy team. All it is now is just changing a few builds around until you found the right combination.
Remeber mix things up a bit, as there is no need to have more than one B-Surge ele or more than 2 mesmers
And that is the basic way of making a decent HA team which with good enough players can carry you to halls.