Now, let me start off by saying I've only been playing a week or so, and am not yet max level. However, I have always played healers from UO to Warhammer to WoW to this and many in between. So while I may not know everything in regards to this game, I've played enough and played enough healers to give my opinion.
I've been doing mainly pvp from level ten to my current level, around 26. At first I noticed myself getting rolled non stop and was pretty frustrating but after learning the nuances, gaining some skills and heading almost exclusively up the healing tree (added willpower) I've noticed myself dominating in healing. Even on bad teams I'm still dominating. I am literally doubling and even tripling the next nearest healer on either team. I don't see why so many people are complaining about healing with a Sorc, I find it to be rather fun and does what its suppose to. Now I rarely try doing damage, I'll root, finish off an enemy if needed but I mainly stick to 100% healing.
I wasn't around very long, but sorc healing is anything but weak..yes we are squishy, but we are healers, not tanks and not fighters. Learn when to fight and when to run.