Sooo tired of tracer missile QQ'ing... I have a merc and use it, but spamming isn't an effective tactic at 50 if yr on a PVP server with players that are worth a damn. But on to the main point of elemental/internal mitigation for tanks:
There should be SOME way (gear stat, maybe? a la Resistance, etc) to improve damage mitigation of this type for tanks (or PVP'ers looking for survivability). It could almost be like anti-Expertise in a way (although I realize expertise affects ALL damage types) and decrease the amount of spike damage taken. Also note that I'm not talking drastic reduction - internal/elemental damage shouldn't be AS mitigated weapon/tech dmg or there'd be no reason for different damage types and make classes (such as powertech) pretty ineffective in PVP. That's my opinion, anyway. (My main is a Juggy tank, level 50 Veela)
I love this game, though, and am perfectly willing to give BW time to work out the kinks.