Firstly I would like to say that as i have never played a CM/BG or a Sage/Sorc, I can in no way fully compare the balance of healing across the classes, however, as a main healer for my guild that has cleared all NiM content and 1/4 ECHM, I feel that I can make some statements about the state of Sawbones healing.
Firstly the above quote is in essence to my mindcorrect, since the 1.2 buff, we have gone from a class that needed to be played perfectly to compete in PVE raiding, to a class that is now to my mind one of the most fun and interesting healing classes I have ever played in a MMO.
However what I would say is that, from what I have seen, a lot of people on this topic have been syaing that we do not have very efficient burst heals, this to my mind is incorrect. I have no energy issues in pumping out an emergency UM followed by EM. In about 2.5-3secs I can put out a minimum of 5k heals, and if both crit I can go up to 9-10k, usually one crits and i get around a 7k heal, not something to be sniffed at. Yes you might say that a Trooper can pump his emergency heal to heal for more, but I can spam 2, possibly 3 rotations of UM and EM without severely hampering my energy rotation, especially if I have some stacks of UH saved up. Plus on its own, KP, is very useful itself in a burst heal situation, usually I heal for about 3.5k noncrit and 5.5-6k crit.
Another thing that I really enjoy about healing as a scoundrel is the amount of survivabilty and utility I have in PVE, for example defense screen on a 45sec cd is to my mind incredible and especially if u spec into the talent, the name eludes me, that increases the healing you take when its up. I find it incredably useful when im doing the puzzle on the 4th boss in KP NiM as it allows me to take 2 hit from pulse droids and then heal myself up to full much quicker than a sage/trooper. The fact that I can vanish mid fight is also incredibly useful as a way to either ress someone without wasting a combat ress or to drop aggro if u see your tank fail. Plus I bring two CC's to the raid if needed.
Tl;DR - Scoundrels/Ops have good burst heals if played well and bring a lot to a raid in the right hands.