The real bummer (unless there's some alternate class feature that gets around this) is that you can't just turn the Wyrmling into a Dragon Familiar, since the class works off of being a Divine caster. That feat would solve a lot of the weaknesses of having to literally babysit the spawn of a creature almost certainly capable of swallowing the PC in two bites.

I'm really not certain what role the class is supposed to fill, but since it's a full caster with a few additional goodies (even if they're not too good), I'd say it's deserving of the score given it.

Dragon Familiar is really the easy way to become a wyrmling-sitter while still getting to do fun things with it.