Skill recommendations/changes:

Force shield (Eng) is pretty much useless, gives too little armor and doesnt take more than 1 hit, ever.
Sonic Boom (Eng) is useless in endgame PvE, PvP, damage is almost non-existant.
Gravity Well (Com) *in my opinion* should, in a diameter of (x), pull all enemies to the targeted enemy.
Psychic Binding (Op) needs a buff.

Is there a sneak peek of the last skill for each class? Maybe an AoE skill for Op, Guardian Angel skill for Eng, Self Destruct skill for Com O.o