I think, expecting from healer to do high dps in the dungeons...it's something laughable. I think healer job is healing and if they do dps that's very beneficial. I, as a new in healer role in FFXIV I think we don't have a reason to complain compared for example wow healer classes.
Probably there is a few things what the developers can make more smooth but I'm very satisfied with what WHM offer me both in dps and healing.