Ability: Explosive Tips ( Forge Blast Arrow)
Weapon: Hunter's Arsenal (Forge Longbow, Arby)
Movement: Desert Shadow (Forge Withdraw), Heroic Leap are the best two movement abilities for the hunter. (If you find anything other than dodge roll on the drop, just take it. Dodge roll is the worst movement ability in the game)
Support Ability: Flare
Second Weapon: You don't need a secondary weapon once you get your hands on a longbow. Sniper works for every class as a secondary weapon. CROSSBOW IS DOGSH*T.

Ability: Saboteur ->You need that cooldown on CG to escape, hit your sniper shot (Forge Concussion Grenade)
Weapon: Assassin's Arsenal(Forge Sniper Rifle)
Movement: Assassin's Speed (Movement Forge Blink) Having a shield that blocks only 300 damage after you blink is not gonna be useful when there is more than one enemy nearby you trying to kill you. The blue shield is also gonna expose your position when you are trying to hide and heal. A 35% blink cd is better and upgrade your blink to have even less cooldown on your blink.
Offensive Ability: Concussion Grenade(Can be used to push off enemies from rushing you, can also be thrown over a hill). Grounding Shock works just fine but it has a range limit and goes only straight.
Second Weapon: Sniper Rifle is a must weapon and secondary should be a slug or revolver. The difference is revolver shoots faster than a slug but deals low damage from long range. Slug deals the same damage in both long and close ranges but slow.

Ability: Creeping Gale (Forge Soul Gust)
Weapon: Mage's Arsenal, Strength of Stone, Killing frost depends on what mode you are playing(Solo vs Squad etc.) (Forge Ice Staff) Stone staff is for pus*ies and console noobs.
Movement: High Flyer (Forge Soar)
Support Ability: Healing Station
Offensive Ability: Soul Gust, Fire Bomb
Second Weapon: Anything except Axe, it is for handicapped pus*ies with 3 fingers and one eye.

Ability: Inspire (Ability Forge Healing Shout)
Weapon: Warrior's Arsenal (Weapon Forge Throwing Axe)
Movement: Brutality (Movement Forge Heroic Leap)
Offensive Ability: Grounding Shock is best for Axe Warrior
Second Weapon: You need only sniper for range battles against assassins If they are keeping their distance from you or have the high ground.

Vigor, Bok Bucks, Incubation
Reflexes for Assassins to scope 25% faster with a sniper rifle
Leg day for Mage, Warrior
Combat Training for Hunter to peek angles faster with a longbow and dodge before you get shot.