I like my healy Op because it's a different feel from what I'm used to with the mana using healing type mechanic, my guild was going to need healers, and I wanted to play something different to see how well I can do with what I knew would be an "underdog" class.
For the record, my main MMO experience was being a hunter in WoW, so getting used to the energy mechanic to use my abilities in this game wasn't a huge stretch, and is honestly less annoying than that hunter experience. At low energy levels I still feel I have options even in bad situations, saving Adrenaline Probe strictly for situations that are intense and my energy level is low, keeping Stim Boost up at all times, and when the raid is high enough in health I use Diagnostic Scan to gradually get their health higher and to recover my energy, and reapply Kolto Probes to get TA stacks in the meantime in case someone almost drops like a rock so I can have the ability to spam Surgical Probe until one of the other healers gets a big heal off (or if I'm alone spam SP and do the very rare Kolto Infusion).
Unfortunately I don't do much PvP so I can't personally comment on the state of Ops healers in Pvp, however in the operations environment (and some hardmode flashpoints) it is a challenge to heal but doable. Currently we can't compete with the other healer classes for burst but we can provide that extra needed healing in a pinch so the healing team in general can be more successful, and have even kept half our 16 man raid up solo when the other healers (1 sorc, 1 bh, and the other ops healer) dropped in intense situations before, so I know it can be done... just much more stressfully than the other classes at times and not with as much of a punch. I can see why many people would have a problem healing like this, and don't like that some raids won't take ops healers because of the rep they now have from nerfs.