Sawbones, and likely the Imperial Equivalent, though I have never played an Operative. We have 0 defensive capabilities, weak HoTs, and only 2 direct heals, one of which can't be cast without a Proc the other gives.
Interruption: We have no protection against this. Our HoTs are far too weak to counteract the sheer levels of burst -any- class can put out. This leaves us spamming Underworld Medicine or Kolto Packs. Underworld Medicine is a 2 second cast time, and if it gets interrupted, you're SoL until it comes back, or you're blowing a GCD on Pistol Whip so you can cast a weak Kolto Pack in the meantime, or begging the RNG gods that your ticks of Slow Release Med Pack are proccing Upper Hand.
Self Protection: Once again, you've left us with nothing. Defensive Screen blocks maybe 3k damage, which is simply 3-4 seconds of damage for any class in the game. Dodge's only purpose is to clear debuffs. It doesn't "dodge" half the incoming attacks, doesn't stop reapplication of DoTs, and doesn't stop interruption. Vanish is equally worthless. For the cost of breaking combat, we become more useless than a Lemming in a factory, unable to heal or be healed for 10 seconds. Furthermore, any halfway intelligent monkey knows to just instantly hit an AoE or Stealth Detection ability, and you're coming right back out of stealth, achieving only a temporary target drop and now unable to heal anything they do for 10 seconds.
Distance Breakers: You must have them against Melee. We don't. We have a stun in a 30 second (talented) CD, and permanent spammable snare. Neither does us any good, as almost all snares in the game that Melee use are Force, and we can't dispel those, not to mention that gratuitous amounts of gap closers they have. I understand why they have them. They have to stay in range of classes with Knockbacks (See every class except Smuggler). We don't have Knockbacks. We have a Flash Bomb. That breaks on damage.
So what does that leave us with? Well we're a one trick pony. Emergent Emergencies. Free Emergency Med Packs sub 30% health. Clutch healing at its finest. Too bad one stun (which generally last 5+ seconds) at sub 30% health is death knocking at your doorstep.
Maybe it's a gear issue. I'm only sitting at 8% Expertise because how abysmally outnumbered the Republic is on my server, making it impossible to do the new Ilum dailies or win 75% of our PvP matches. I've just been healing MMO's for a long long time, and all the tools that a healer needs are not there. At the end of the day, a DPS should be able to kill a healer. They just shouldn't be able to do it so lopsidedly.