I think that the shield resistance cap is way too high at the moment.
As proof, in PVP a shield buffed target is nearly invincible. I think that every one realizes this, but could be wrong.
The high shield resistance cap + defense bonuses make for some unstoppable targets.
Whereas a target with only self buffs, is popcorn.
The high shield resistance creates a situation where only a Sub Nuc can assist in taking the target down. (Debuffs from a tac will not be sufficient, even with a disruptor proc, because those debuffs only increase total damage or debuff the hull resistances of a target -which is ignored by a % by high shield resists-)