It is not the best but with proper kiting and positioning, you can survive quite well. Resto druids' healing throughput is not astonishing but the utility gained from powershifting and CC is great when being focused helping you to survive.
rogue+hunter burst can give you hard time. i can hardly heal through it and iam almost full 496. What i advise to care about is how to heal your team. A rookie druid can be easily caught in long cc chain and loose his partner.