ultimate versus normal adventurers

Unless you're a post justice buccaneer.

Or I/L mage.

Or bowmaster...

Or either classic thief...

If you want the semi-useful attack skills, you can always do the quests on any adventurer. With all the 2x events GMS throws at us, it is not even that hard.
The summon is not really interesting, the HP is not high enough to make a difference and the medal is easily replaced by medals earned from quests. I do know that vampire has its uses though.