Sell me on your favorite Genie Warlock

Never played on myself but I always liked the idea. Efreet seems pretty straight forward, high damage spells plus fire resistance. Dao has the "cheese grater" technique and bludgeoning resistance.

Marid and Djinni don't seem to great to me spell wise (greater invis, Cone of cold are the exception but they take a while)

But maybe I'm not seeing the real potential here