Edit: Never mind me, PvP. Was looking at the wrong bonuses.
Vanguards and Powertechs aren't useless because of 1.4, notice all the ranked teams and players still dominating with them. If you actually read into it right, they actually got a damage buff with Sticky Grenade/Explosive Dart now on a separate CD from Assault Plastique/Thermal Detonator. Just learn how to kite the marauders and keep them in the 5-10m range from you.
Teach me how to quite a class that has 4 defensive skills, can use force leap, can use force Grip, can put me a "slow" debuff, can be invisible and use some kind of "sprint"...all this withouth using "Hold the line" from Tactics tree and with only 1 stupid defensive skill that mitigates only 25% dmg. Teach me master.
pd: I can kill almost every other class with skillt. But with marauders it's not a matter of skill. It's a matter of my class with Assault tree can not kill a marauder in 1 vs 1 with same gear.