Her AD ratios definitely need to be lowered, but I feel like her biggest issue is her passive combined with her ult. She brings two newish roles to the table, and she excels at both of them. Something probably needs to be changed on her to remove ONE of these roles.
First, because of her tentacles, she wastes people who try to fight her once she's had a chance to entrench herself. It's not impossible to beat her once she's got 2 or 3 tentacles out, but it's difficult for most champions in the game. I think this brings a pretty cool dynamic to the table, and love the way it changes the game. It also fits with the juggernaut theme pretty well.
The problem is that, MOSTLY because of her ult, she is very, very good at taking on multiple champions by herself. So far, in most of the games I've played her in (both as her and against her), a jungler coming in for a gank has a pretty high chance of turning into a double kill for her, and I've used her to tp into a 2v5 fight and pick up a triple kill without taking much net damage.
Both of these are interesting niches, but I don't think she should be filling them both as well as she is. I think the former is a lot cooler, and as much fun as I have playing her, her ult probably needs to spawn fewer tentacles.
The other experience I've had playing as her is that I am able to absolutely trash anyone if I'm able to hit both them and their spirit with only a single Q. Lowering the AD on her Q might help that, but it feels like her E should be altered so the damage transfered from the spirit is reduced if you are being struck by the same ability.