My suggestions is to form your own hero builds. Use what you have available, with a better synergy. Look into what foes and their skills you'll be facing, and build accordingly.
Generally speaking, preventing damage is far superior to just healing over it. With that being said, there are multiple ways to do this, and not by simply using monks or rits.
Some key skills: vs physical mobs - using weakness.(highly effective) Enfeebling Blood, "Save Yourselves!", Anthem of Weariness.
-Using blind. Unseen Fury, Ebon Dust Aura, Shadowsong.
or even using skills that don't condition the foe, like "Cant Touch This!"
Of course, bring cover conditions, or more spammable conditions to keep them on the enemy physicals.
Now about that pesky spell damage. Some favorite counters are to just bring armor buffs, to lower the damage taken, mainly through "Save yourself!", and possibly to have Ward Againced Elements.
There's way more, much larger list. You get the idea. But that said and done, it wont always protect you 100% of the time. This is where the healing/protecting backline comes into play. I'm not going into details about monk/rit/ele healing/prot builds, but change some skills to adapt with what the enemy is using.
Example, vs heavy hexes, maybe you want to bring Divert Hexes. If they are condition heavy, mabe you would want to bring Restore Conditions. Basically make it suit how much damage, and types of damage you will be dealing with(degeneration via hex/condition, spell spike, physical spike, range pressure ect...) beyond the normal team defenses.
Now that you hopefully have you and your heroes outfitted to survive, bring adamage type to suit your primary toon, i.e. Physicals, maybe more adrenaline based, with an adrenaline booster in the party using dark fury, or anthem of fury.
Basically the list goes on and on with variants upon variants. This isn't your standard MMO where you keep the same skill-set for the majority of the game so use it to your advantage! Take a couple extra minutes on tweaking you and your heroes before heading off to battle. I guarantee those two minutes of setup far outweighs the possible hours of frustration you may deal with using standardized wiki builds, expecting it to go perfectly.
Hopefully this post isn't too long for ya. but i do hope it will enhance your GW experiance, and not scare you off
