Perhaps broken is a bit harsh. But here is my point
Resto druids have always been raid healers. With wild growth, hots, and now efflorescence, we can heal multiple people relatively quickly. Now with cata, that's not the case, and YES, I understand that this is not WoTLK anymore. But from everything I've seen from beta video's, top guild logs, etc, it seems that resto druids are very good tank healers and TERRIBLE raid healers, and here's why.
3x lifebloom and nourish spam is not only effective healing for a tank, but it is essentially endless healing for the druid. With a low cost to nourish, lifebloom consistently being refreshed, and Omen procs used for healing touch (as it refreshes lifebloom stacks) we can basically heal forever, given you are properly geared with a nice amount of spirit. In periods of extra damage, we can throw on a rejuv for extra healing, swiftmend it for a high instant heal, and continue spamming nourish. But what happens when your raid (or even the other 4 people in your heroic dungeon) take damage?
Lets look at your options, Wild growth and efflorescense.
Wild growth right now, is a joke. With a relatively large mana cost, it should be worth it. Yet it's healing for half of what I saw in WoTLK, while our health pools have Quadrupled. With decent gear, you can expect wild growth to give about 5-7% health to the people it affects, and that's kind of a generous percentage to be honest. Should it be giving 20% health? Of course not, but with a 5k mana cost, I feel that it should be a bit higher.
Your other AoE option, efflorescense.
First, to get this spell, you need to cast a Rejuv (4.8k mana) then cast swiftmend (1.8k mana). Having to cast 2 spells is a bit clunky, especially with how high the cost is, but even when you do this, the buff from efflorescense is 500 or so a second for 7 seconds, meaning the person you swiftmend and anyone directly around him will get the full benefit... a whopping 3-4k health out of your 110k. Again, a simple fix for this would be a moderate buff to the % from swiftmend, and possibly remove the mana cost of swiftmend (this idea is not ridiculous, I remind you holy paladins have multiple heals that do not cost any mana).
I'm finding that my GM is sitting me for holy paladins, and with all these class changes for "bring the player, not the class", this doesn't seem right. My guilds tanks have asked me multiple times, "are you sure you have the right gear set on?" when I cast WG and they see a tooltip saying "healing for 409 every second". I've been told to go boomkin rather than heal in many encounters, and other healer classes are brought in.
I know my class, I've been healing since I started playing, and I loved my druid throughout the last 2 expansions. But I feel gimped at the moment, and being in a progression raiding guild that's very competitive on my server, its not a good spot to be in. Am I doing something drastically wrong, or do other people feel this way as well?
TLDR: Scroll back up and read it you lazy troll :P