RDM has always been my fav class since FFXI. Despite what people think, RDM is a jack of ALL trades. An RDM is meant to be able to do everything, heal, attack, whatever. The damage XIV RDMs have are on par with a Ninja, Sams and Monks still out power them but up with a Ninja and your about the same.
As many have said however, even with the ability to double heal and quick revive over and over, RDMs were always more a support healer then a full on healer. Anyone expecting us to be a main healer is an idiot.

Over all RDMs are perfect for people who what to be able to play any style they want, attacker, support healer, whatever RDM gives people that option.