I love Artemis... she has her flaws, but that makes it more fun and challenging to use her. She has some niche abilities that are good. To give her effectiveness at range zero also would seem to make her undercosted to me.
She's in my Priestess book for a few reasons... she complements the other spells there very well. Maybe it is that you are looking at her alone, and not considering what she can do in conjunction with the rest of a book?